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  • Spektralphotometrie  (23)
  • 03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics
  • 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
  • LIDAR
  • Springer  (30)
  • American Geophysical Union  (4)
  • Essen : Verl. Glückauf
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • 2005-2009  (9)
  • 1970-1974  (25)
  • 1940-1944
  • 2007  (9)
  • 1974  (25)
Collection
Keywords
Publisher
Years
  • 2005-2009  (9)
  • 1970-1974  (25)
  • 1940-1944
Year
  • 1
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    NDSC Intercomparison of Stratospheric Aerosol Processing Algorithms (2007)
    Springer
    Details
    Publication Date: 2020-11-23
    Description: Scattering ratios R processed from the same raw data at 353 and 532 nm by different lidar groups agree within about 10 % for high and within about 4 % for low aerosol loading. In the main layer aerosol backscatter coefficients agree within about 30 % for high and within about 40 % for low aerosol loading
    Description: Published
    Description: Berlin, Germany
    Description: 1.8. Osservazioni di geofisica ambientale
    Description: open
    Keywords: NDCS ; LIDAR ; 01. Atmosphere::01.01. Atmosphere::01.01.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 2
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    Hydrogeochemistry and water balance in the coastal wetland area of "Biviere di Gela" (Italy) (2007)
    Springer
    Details
    Publication Date: 2017-04-04
    Description: In the study area physical and chemical factors control the composition of surface and groundwaters, which in turn determine the water quality of the “Biviere di Gela” lake. These factors combine to create diverse water types which change their compositional character spatially as rainfall infiltrates the soil zone, moves down a topographically defined flow path, and interacts with bedrock minerals. Low-salinity waters, which represent the initial stage of underground circulation, start dissolving calcium carbonate from the local rocks. The progressive increase in salinity, characterized by substantially higher Ca, SO4, Na and Cl concentrations, suggests that dissolution of CaSO4 and NaCl is an important process during water–rock interactions. The “Biviere di Gela” lake is often separated into two units (Lago Grande and Lago Piccolo). “Lago Grande” water is generally of Na-SO4-Cl-type, whereas “Lago Piccolo” water is of Na-Cl-SO4-type. Their total content of dissolved salts varies with season, the amount of rainfall, and inflow of ground and drainage water. Over time, an increasing trend towards greater salinity and also sudden changes in the relative abundances of Cl and SO4 have been recorded for the “Lago Grande.” The isotope composition of the lake water appears to be affected by inflow of ground and surface waters and also by evaporative loss. The nitrate content of waters from the recharge basin is of particular concern because it contributes to lake eutrophication. The trace element contents do not evidence the presence of any significant metal contamination of lake waters, although a future potential hazard of metals bioaccumulation by the aquatic biota must be taken into consideration. Finally, a water balance for the basin shows that a drop in precipitation of about 20% might be critical for lake survival.
    Description: Published
    Description: JCR Journal
    Description: reserved
    Keywords: wetland area ; hydrogeochemistry ; environmental geochemistry ; isotope geochemistry ; water balance ; 03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 3
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    Geophysical and hydrogeological experiments from a shallow hydrothermal system at Solfatara Volcano, Campi Flegrei, Italy: Response to caldera unrest (2007)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Integration of high-resolution geophysical and hydrogeological investigations at Solfatara Volcano, Campi Flegrei, Italy, allowed us to (1) image the shallow and intermediate subsurface to the crater, (2) elucidate patterns in the shallow subsurface degassing, and (3) refine and upgrade volcano-monitoring strategies for this dynamic area. Our results show that the subsurface to the crater can be divided roughly into two zones: a dry, outcropping layer overlying a horizon saturated by hydrothermal fluids. Within this saturated zone, intersections of dominant NW- and ENE-striking structural lineaments act as preferential escape conduits for the fluids which generate high microseismic noise amplitudes in the southeastern part of the crater. Hydrogeological data suggest an uprising of the isotherms below Solfatara crater, and a marked increment of fluid degassing, over the last 40 years. Sudden variations of both seismic noise level and noise cycling are positively correlated with early stages of ground inflation during the AD 2000 uplift. We believe therefore that monitoring of seismic noise can be used for upgrading early warning strategies in this sector of the Campi Flegrei volcanic system.
    Description: Published
    Description: B06201
    Description: 3.6. Fisica del vulcanismo
    Description: JCR Journal
    Description: reserved
    Keywords: Geophysical ; hydrogeological ; experiments ; Solfatara ; 03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 4
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    Best-fit results from application of a thermo-rheological model for channelized lava flow to high spatial resolution morphological data (2007)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: The FLOWGO thermo-rheological model links heat loss, core cooling, crystallization, rheology and flow dynamics for lava flowing in a channel. We fit this model to laser altimeter (LIDAR) derived channel width data, as well as effusion rate and flow velocity measurements, to produce a best-fit prediction of thermal and rheological conditions for lava flowing in a ~1.6 km long channel active on Mt. Etna (Italy) on 16th September 2004. Using, as a starting condition for the model, the mean channel width over the first 100 m (6 m) and a depth of 1 m we obtain an initial velocity and instantaneous effusion rate of 0.3–0.6 m/s and ~3 m3/s, respectively. This compares with field- and LIDAR-derived values of 0.4 m/s and 1–4 m3/s. The best fit between model-output and LIDAR-measured channel widths comes from a hybrid run in which the proximal section of the channel is characterised by poorly insulated flow and the medial-distal section by well-insulated flow. This best-fit model implies that flow conditions evolve down-channel, where hot crusts on a free flowing channel maximise heat losses across the proximal section, whereas thick, stable, mature crusts of ′a′a clinker reduce heat losses across the medial-distal section. This results in core cooling per unit distance that decreases from ~0.02–0.015°C m−1 across the proximal section, to ~0.005°C m−1 across the medial-distal section. This produces an increase in core viscosity from ~3800 Pa s at the vent to ~8000 Pa s across the distal section.
    Description: Published
    Description: L01301
    Description: 3.6. Fisica del vulcanismo
    Description: 3.5. Geologia e storia dei sistemi vulcanici
    Description: JCR Journal
    Description: reserved
    Keywords: Kava Channel ; LIDAR ; thermal modeling ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 5
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    Stress induced elastic anisotropy of the Etnean basalt: Theoretical and laboratory examination (2007)
    American Geophysical Union
    Details
    Publication Date: 2017-04-03
    Description: A theory, the stress-sensitivity approach, has been developed, which relates the elastic moduli of anisotropic rocks to the stress tensor and pore pressure for an arbitrary symmetry of the applied load. The theory explains the stress-induced changes of seismic velocities in terms of stress-induced changes of the pore space geometry. The stress dependent anisotropy is described in terms of Thomsen’s anisotropy parameters, g and d. To test the theory we analyze the laboratory (high frequency) results of deformation of an isotropically crack damaged dry lava flow basalt from Mt. Etna volcano. The theory states that, under an anisotropic (i.e. axisymmetric triaxial) load and in the case of an initially isotropic rock, (1) the anisotropy parameters are linear functions of the stress exponentials (i. e. exponential functions of principal stress components) and (2) the ratio of these anisotropy parameters as a function of the stress is constant. In order to verify these relationships, the stress exponentials and the anisotropy parameters based on the measured velocities are computed as well as the expected ratio of the Thomsen’s parameters. Our experimental results are in very good agreement with the theoretically predicted relations.
    Description: Published
    Description: L11307
    Description: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Description: JCR Journal
    Description: reserved
    Keywords: rock mechanics applied to volcanoes ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 6
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    Imaging slow failure in triaxially deformed Etna basalt using 3D acoustic-emission location and X-ray computed tomography (2007)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: We have deformed basalt from Mount Etna (Italy) in triaxial compression tests under an effective confining pressure representative of conditions under a volcanic edifice (40 MPa), and at a constant strain rate of 5 10 6 s 1. Despite containing a high level of pre-existing microcrack damage, Etna basalt retains a high strength of 475 MPa. We have monitored the complete deformation cycle through contemporaneous measurements of axial strain, pore volume change, compressional wave velocity change and acoustic emission (AE) output. We have been able to follow the complete evolution of the throughgoing shear fault without recourse to any artificial means of slowing the deformation. Locations of AE events over time yields an estimate of the fault propagation velocity of between 2 and 4 mm/s-1. We also find excellent agreement between AE locations and post-test images from X-ray microtomography scanning that delineates deformation zone architecture. Citation: Benson, P. M., B. D. Thompson, P. G. Meredith, S. Vinciguerra, and R. P. Young (2007), Imaging slow failure in triaxially deformed Etna basalt using 3D acoustic-emission location and X-ray computed tomography
    Description: Published
    Description: L03303
    Description: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Description: JCR Journal
    Description: reserved
    Keywords: fault imaging ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 7
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    Polar Stratospheric Cloud Measurements by Multispectral Lidar at Sodankyla in Winter 1994/95 (2007)
    Springer
    Details
    Publication Date: 2017-04-04
    Description: Polar stratospheric clouds (PSC) play a major role in the process of Arctic and Antarctic ozone depletion due to heterogeneous chemical reactions responsible for chlorine acti-vation, and particle sedimentation redistributing nitrogen species in the stratosphere. Therefore the phase, size and the composition of PSCs should be known. PSC can be divided into PSC type I, observed at temperatures some degrees above the ice frostpoint, and PSC type II consisting of water ice particles occurring at temperatures below the frostpoint. PSC type I can be subdivided into aspherical (type Ia) and spherical (type Ib) particles. Measurements of gas phase HNO3 removal in presence of PSCs and labora¬tory studies led to the assumption that PSC type I consist of nitric acid trihydrate and theparticle shape depends on the cooling rate [1]. However the explanation ofPSC I based solely on the NAT-hypothesis can not explain a large amount of data [2], and other compositions like liquid supercooled ternary solu¬tions (STS) of H2O, HNO3 and H2SO 4 are discussed now [3].Multiwavelength, 2-polarization lidar measurements give information about the size distribution, refractive index and physical state of the cloud particles.
    Description: Published
    Description: Berlin, Germany
    Description: 1.8. Osservazioni di geofisica ambientale
    Description: open
    Keywords: PSC ; LIDAR ; 01. Atmosphere::01.01. Atmosphere::01.01.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 8
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    Hydrologic and geochemical survey of the lake “Specchio di Venere” (Pantelleria island, Southern Italy) (2007)
    Springer
    Details
    Publication Date: 2017-04-04
    Description: Hydrological and geochemical studies performed on Lake Specchio di Venere on Pantelleria island (Italy) indicate that this endorheic basin has been formed through upwelling of the water table, and that it is continuously fed by the thermal springs situated on its shores. The lake is periodically stratified both thermally and in salinity, albeit this stratification is rather unstable over time since meteorological events such as strong rain or wind can determine the mixing of its waters. Periodical analyses of the lake water chemistry show large variations of the salt content due to the yearly evaporation-rain dilution cycle. These processes are also responsible for the saline stratification during steady meteorological conditions. The mineralogical characterisation of the bottom sediments shows the almost exclusive presence of neoformation minerals, mainly carbonates, formed in response to the pH gradient between spring- (pH≈6) and lake-waters (pH≈9). Finally, the CO2 partial pressures in the lake water slightly exceeding the atmospheric one, are due to the large amounts of CO2 brought to the lake through the bubbling free gas phase of the thermal springs. Nevertheless the high pH value of the lake water, its small volume and its periodical mixing prevent dangerous built up of this gas.
    Description: Published
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: JCR Journal
    Description: reserved
    Keywords: Pantelleria island ; volcanic lake ; gas hazard ; 03. Hydrosphere::03.02. Hydrology::03.02.02. Hydrological processes: interaction, transport, dynamics ; 03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 9
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    The Campanian Ignimbrite (southern Italy) geochemical zoning: insight on the generation of a super-eruption from catastrophic differentiation and fast withdrawal (2007)
    Springer
    Details
    Publication Date: 2017-04-04
    Description: More than ca 100 km3 of nearly homogeneous crystal-poor phonolite and ca 100 km3 of slightly zoned trachyte were erupted 39 ka during the Campanian Ignimbrite super eruption, the most powerful in the Neapolitan area. Partition coefficient calculations, equilibrium mineral assemblages, glass compositions and texture were used to reconstruct compositional, thermal and pressure gradients in the pre-eruptive reservoir as well as timing and mechanisms of evolution towards magma chamber overpressure and eruption. Our petrologic data indicate that a wide sill-like trachytic magma chamber was active under the Campanian Plain at 2.5 kbar before CI eruption. Thermal exchange between high liquidus (1199 C) trachytic sill and cool country rocks caused intense undercooling, driving a catastrophic and fast (102 years) in situ fractional crystallization and crustal assimilation that produced a water oversaturated phonolitic cap and an overpressure in the chamber that triggered the super eruption. This process culminated in an abrupt reservoir opening and in a fast single-step high decompression. Sanidine phenocrysts crystal size distributions reveal high differentiation rate, thus suggesting that such a sill-like magmatic system is capable of evolving in a very short time and erupting suddenly with only short-term warning.
    Description: Published
    Description: On line First
    Description: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Description: 3.6. Fisica del vulcanismo
    Description: 4.3. TTC - Scenari di pericolosità vulcanica
    Description: JCR Journal
    Description: reserved
    Keywords: Campanian Ignimbrite ; Super eruption ; Crystal size distribution ; Partition coefficients ; 04. Solid Earth::04.04. Geology::04.04.04. Marine geology ; 04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 10
    Electronic Resource
    Electronic Resource
    Remote measurement of NO2 emission from a chemical factory by the differential absorption technique (1974)
    Springer
    Applied physics 4 (1974), S. 181-182 
    Details
    ISSN: 1432-0630
    Keywords: LIDAR ; Air pollution ; Tunable dye laser ; NO2 ; Differential absorption technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Using the differential absorption method the NO2 concentration within the plume of a smoke stack and over the area of a chemical factory was measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884276
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  • 11
    Electronic Resource
    Electronic Resource
    Applications of tunable dye lasers to air pollution detection: Measurements of atmospheric NO2 concentrations by differential absorption (1974)
    Springer
    Applied physics 3 (1974), S. 115-119 
    Details
    ISSN: 1432-0630
    Keywords: LIDAR ; Air pollution ; Tunable dye laser ; NO2 ; Differential absorption technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Remote measurements of atmospheric NO2 concentrations by means of a LIDAR system equipped with a tunable dye laser are reported. Using the differential absorption method, concentration values of about 0.2 ppm were detected over the city of Cologne at distances up to 4 km.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884408
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  • 12
    Electronic Resource
    Electronic Resource
    Spektralphotometrische Bestimmung von Val5-Angiotensin II Asp1-β-amid durch Azokupplung mit p-Chlorbenzoldiazoniumchlorid (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 269 (1974), S. 187-192 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Val5-Angiotensin II Asp1-β-amid, Hypertensin, Peptidhormone ; Spektralphotometrie ; Azokupplung mit Halogenbenzoldiazoniumsalz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Am Beispiel des Octapeptids Val5-Angiotensin II Asp1-β-amid (Hypertensin-CIBA) wird die Möglichkeit aufgezeigt, Polypeptidhormone mit Tyrosin und/oder Histidin im Molekül über eine Kupplung mit p-halogensubstituierten Benzol-diazoniumsalzen quantitativ zu erfassen. Durch photometrische Bestimmung des Kupplungsprodukts konnten noch 1–2 nMol Hypertensin nachgewiesen werden. Eine Steigerung der Empfindlichkeit läßt sich durch Kupplung des Polypeptids mit radioaktiv markierten Diazoniumsalzen erreichen. Die als besonders günstig ermittelten Bedingungen für die Diazotierungs- und Kupplungsreaktionen werden mitgeteilt. Das Kupplungsprodukt war papier-chromatographisch einheitlich. Es handelt sich vermutlich um eine Monoazoverbindung. Unter den gewählten Bedingungen stellt sehr wahrscheinlich Tyrosin den kupplungsfähigen Aminosäurerest im Hypertensinmolekül dar.
    Notes: Abstract Through the azocoupling of Val5-angiotensin II-Asp1-β-amide (Hypertensin-CIBA) with p-halogene substituted benzenediazonium salts the possibility is shown for quantitative determination of polypeptides containing tyrosine and/or histidine. 1 to 2 nanomoles of the coupling-product could be measured photometrically. The detection limit can be lowered, if the polypeptide is coupled with a radioactive labelled diazonium salt. The preferable reaction conditions for diazotising and coupling are reported. The reaction-product showed an uniform behaviour in the used paper-chromatographic system. Probably it is a monoazo compound. Under the chosen conditions the tyrosyl group is very likely the reacting part of the hypertensin molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424312
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  • 13
    Electronic Resource
    Electronic Resource
    Spektralphotometrische Bestimmung von p-Phenetidin, p-Aminophenol und p-Amino-phenoxy-essigsäure nach quantitativer Trennung aus wäßriger Lösung (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 268 (1974), S. 367-368 
    Details
    ISSN: 1618-2650
    Keywords: Best. von p-Phenetidin, p-Aminophenol, p-Amino-phenoxy-essigsäure ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01155029
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  • 14
    Electronic Resource
    Electronic Resource
    Photometrische Sulfitbestimmung mit Trinitrobenzoesäure (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 269 (1974), S. 15-18 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Sulfit mit Trinitrobenzoesäure ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung SO3 2− kann mit Trinitrobenzoesäure innerhalb von 2 min photometrisch bestimmt werden. SO4 2−, S2O3 2−, S2− und SxO6 2− in Konzentrationen bis zu 1 mMol/100 ml stören nicht. Die untere Bestimmungsgrenze beträgt 0,22mg SO3 2−/100 ml, die Standardabweichung bei der Bestimmung von 7 mg SO3 2− ± 0,59 Rel.-%.
    Notes: Abstract SO3 2− can be determined photometrically with trinitrobenzoic acid within 2 min. SO4 2−, S2O3 2−, S2− and SxO6 2− in concentrations up to 1 mMole/100 ml do not interfere. The limit of determination is 0.22 mg SO3 2−/100 ml, the standard deviation for the determination of 7 mg SO3 2− is ± 0.59 Rel.-%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423932
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  • 15
    Electronic Resource
    Electronic Resource
    Spektralphotometrische Bestimmung von Hydroxypropylgruppen in Cellulose-Mischäthern mit Ninhydrin (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 31-31 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Hydroxypropylgruppen in Cellulose-Mischäther ; Spektralphotometrie ; Ninhydrin als Reagens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437488
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  • 16
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of amylose by double wavelength method (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 208-208 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Amylose ; Spektralphotometrie ; zwei Wellenlängen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430736
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  • 17
    Electronic Resource
    Electronic Resource
    Direct spectrophotometric determination of aluminium with SPADNS (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 284-284 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Aluminium ; Spektralphotometrie ; SPADNS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432832
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  • 18
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of copper, nickel and cobalt after extraction with benzoyltrifluoroacetone (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 286-286 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Kupfer, Nickel, Kobalt mit Benzoyltrifluoraceton ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432835
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  • 19
    Electronic Resource
    Electronic Resource
    Hochselektive spektralphotometrische Bestimmung von Nitrat mit β-Methylumbelliferon (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 359-361 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Nitrat mitβ-Methylumbelliferon ; Spektralphotometrie ; hochselektive Modifikation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Anwendbarkeit der spektralphotometrischen Nitratbestimmung mitβ-Methylumbelliferon wurde durch folgende Maßnahmen wesentlich erweitert: Abtrennung auftretender Niederschläge mit einem Membranfilter aus Cellulosenitrat, Fällung bzw. Maskierung störender Anionen mit AgClO4 und Reduktion störender Kationen mit Na2SO3. Der Einfluß von mehr als 60 Kationen und 20 Anionen auf die NO3 −-Bestimmung wird angegeben.
    Notes: Abstract The applicability of the spectrophotometric nitrate determination by utilizingβ-methylumbelliferone has been extended by the following measures: Separation of eventual precipitates by means of a membrane filter consisting of cellulose nitrate, separating or masking of interfering anions with AgClO4 and reduction of interfering cations by the use of Na2SO3. The influence of more than 60 cations and 20 anions on the determination of nitrate is listed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00820741
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  • 20
    Electronic Resource
    Electronic Resource
    A new possibility for the spectrophotometric determination of steroid sulphates (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 37-39 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Steroidsulfaten ; Spektralphotometrie ; Cu-Pyridin-Komplex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A new procedure has been developed for the quantitative determination of steroid sulphates. The basic principle of the method is that a pyridine solution of the pyridinium salt of the steroid sulphate is shaken at room temperature with metallic copper powder or copper(I)-oxide, and the intensity of the coloured complex formed is measured at 310–350 nm. The method is suitable both for the total steroid sulphate determination of various extracts, and for the quantitative determination of steroid sulphates previously separated by some other method. Errors are in the range of 0.5–2%.
    Notes: Zusammenfassung Eine Lösung des Pyridiniumsalzes des Steroidsulfats in Pyridin wird bei Raumtemperatur mit metallischem Kupferpulver oder Kupfer(I)-oxid geschüttelt und die Absorption des gebildeten Farbkomplexes bei 310–350 nm gemessen. Das Verfahren eignet sich zur Bestimmung des Gesamtgehaltes an Steroidsulfat in verschiedenartigen Extrakten sowie zur Bestimmung von zuvor abgetrenntem Steroidsulfat. Die Fehler liegen im Bereich von 0,5–2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430527
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    Spectrophotometric determination of silver(I) with 4-(2-pyridylazo)-resorcinol (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 44-44 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Silber mit 4-(2-Pyridylazo)-resorcin ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430531
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  • 22
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    Spectrophotometric determination of traces of cobalt with 1-naphthamidoxime (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 48-48 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Kobalt mit 1-Naphthamidoxim ; Spektralphotometrie ; Spuren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430535
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  • 23
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    Extraction spectrophotometric determination of iron(II) with Thiodibenzoylmethane (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 283-283 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Eisen(II) mit Thiodibenzoylmethan ; Spektralphotometrie ; Extraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431342
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  • 24
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    Bestimmung des freien Glykolaldehydgehaltes in Äthylenglykol (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 284-285 
    Details
    ISSN: 1618-2650
    Keywords: Bestimmung von Glykolaldehyd in Äthylenglykol ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431344
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  • 25
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    Note on the spectrophotometric determination of cerium(IV) with crystal violet (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 364-364 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Cer(IV) mit Kristallviolett ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424024
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  • 26
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    Spectrophotometric microdetermination of palladium with chromotrope 2R (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 366-366 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Palladium mit Chromotrop 2R ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424027
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  • 27
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    Acenaphthenequinonemonoxime as a spectrophotometric reagent for the determination of iridium by solvent extraction (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 268 (1974), S. 31-32 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Iridium mit Acenaphthenchinonmonoxim ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430905
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    On the use of spectrophotometric methods for the determination of the composition of metal complexes (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 269 (1974), S. 97-99 
    Details
    ISSN: 1618-2650
    Keywords: Best. der Zusammensetzung von Metallkomplexen ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary If the method of continuous variations as well as methods like the molar-ratio method are applied to complex formation reactions that take place stepwise, plots can be obtained in which the existence of intermediate complexes is fully obscured. An illustration is given for the complex formation between Cu2+ and pyridine-2,6-dicarboxylic acid.
    Notes: Zusammenfassung Über den Gebrauch spektralphotometrischer Methoden zur Bestimmung der Zusammensetzung von Metallkomplexen. Wenn die Methode der kontinuierlichen Variationen und Verfahren wie die Molar-ratio-Methode für den Fall stufenweiser Komplexbildung angewendet werden, können graphische Darstellungen erhalten werden, in denen die Existenz von intermediären Komplexen völlig verdeckt ist. Dies wird für die Komplexbildung zwischen Kupfer(II) und Pyridin-2,6-dicarbonsäure gezeigt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424680
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  • 29
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    Über eine neue photometrische Aminosäurebestimmung mit p-Benzochinon in biologischen Flüssigkeiten (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 269 (1974), S. 182-187 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Aminosäuren mit p-Benzochinon ; Spektralphotometrie ; Charge-Transfer-Komplexe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aminosäuren können in Gegenwart organischer Lösungsmittel als Elektronen-Donator-Acceptor-Komplexe mit p-Benzochinon bestimmt werden. Die Methode vereinigt stabile Farbreaktion, hohe Empfindlichkeit (ɛ 490=2,5 cm2/μMol α-Aminosäure, 4,4 cm2/μMol α,ɛ-Aminosäure und ɛ 525=4,65 cm2/μMol Prolin), rasche, einfache und billige Durchführung mit guter Reproduzierbarkeit, ausreichender Spezifität und Unempfindlichkeit gegenüber Ammoniak und anorganischen Verbindungen. Es werden optimale Bedingungen für die Bestimmung von Aminostickstoff im Serum und Urin und Normalwerte bei Gesunden beschrieben.
    Notes: Abstract Amino acids can be determined as charge-transfer complexes by reaction with p-benzoquinone in the presence of organic solvents. This method combines high sensitivity (ɛ 490=2.5 cm2/μmole α-amino acid and 4.4 cm2 /μmole α,ɛ-amino acid; ɛ 525=4.65 cm2/μmole proline) and rapid, cheap and simple procedure with good reproducibility, sufficient specifity, stable colour and insensitivity to ammonia and inorganic compounds. Optimal conditions and normal values are reported for the determination of amino nitrogen in serum and urine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424311
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    Spectrophotometric determination of trace amounts of iron(II) using 7-nitroso-8-hydroxyquinoline-5-sulphonic acid as reagent (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 32-32 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Eisen(II) mit 7-Nitroso-8-hydroxychinolin-5-sulfonsäure ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00595883
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    Determination of empirical parameters of solvent polarity E T in binary mixtures by solvatochromic pyridinium-N-phenol betaine dyes (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 100-104 
    Details
    ISSN: 1618-2650
    Keywords: Analyse von binären Lösungsmittelgemischen ; Spektralphotometrie ; Solvatochrome Farbstoffe, synergistische Polaritätseffekte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Empirical parameters of solvent polarity E T of some pure solvents and their binary mixtures (especially with CCl4 and CHCl3) were determined spectrophotometrically using solvatochromic pyridinium-N-phendl betaine dyes. Calibration curves are given for 16 binary solvent mixtures. The obtained E T values show that a synergetic polarity effect appears with the organic solvents containing C=O, P=O, and S=O groups in the mixture with chloroform. With these binary mixtures the increase of E T values results from the formation of 1∶1 complexes X=O... H-CCl3 by means of hydrogen bonding. Increasing number of methylene groups in the chain increases the synergism with these type of complexes.
    Notes: Zusammenfassung Empirische Parameter der Lösungsmittelpolarität E T einiger reiner Lösungsmittel und ihrer binären Mischungen (insbesondere mit CCl4 und CHCl3) wurden mit Hilfe von solvatochromen Pyridinium-N-phenolbetain-Farbstoffen bestimmt. Für 16 binäre Lösungsmittelgemische wurden Eichkurven ermittelt. Die erhaltenen E T -Werte zeigen, daß organische Lösungsmittel mit C=O-, P=O- und S=O-Gruppen in Mischungen mit Chloroform einen synergistischen Polaritätseffekt aufweisen. Die Zunahme der E T -Werte in diesen binären Mischungen beruht auf der Bildung von durch Wasserstoff brücken gebundenen 1∶1-Komplexen X=O... H-CCl3. Die Verlängerung der Alkylkette führt zu einer Zunahme des Synergismus bei dieser Art von Komplexen.
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    URL: http://dx.doi.org/10.1007/BF00434059
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    Determination of chromium(III) with EDTA at the ppm-level by difference spectrophotometry in the UV-region (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 206-207 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Chrom(III) mit ÄDTA ; Spektralphotometrie ; Differenzmethode im UV-Bereich
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00445961
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    Bestimmung organisch gebundenen Fluors in biologischem Material (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 278-282 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Fluor in Biolog. Material ; Spektralphotometrie ; Applikation von Flufenaminsäure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Nach Extraktion aller F-haltigen Substanzen (intakte Substanz plus Summe aller Metaboliten) aus Urin (alkalisch in der Wärme hydrolysiert) von Menschen und Tieren, welche Flufenaminsäure bzw. deren Derivate appliziert bekamen, können Untersuchungen der Ausscheidungsbilanz durchgeführt werden. Nach alkalisch oxidativem Abbau (Wurzschmittsche Bombe) wurde aus schwefelsauren Ansätzen mit SiO2 destilliert und die Ansätze mit Alizarin-3-methylamin-N,N-diessigsäure-Cer(III)-Komplex bei pH 4,35 colorimetrisch untersucht. Messungen im Konzentrationsbereich ≤1 μg pro Meßansatz sind möglich. Die Ergebnisse der renalen Elimination von Flufenaminsäure und Metaboliten beim Menschen (49,4±4,6%; N=10) stimmen größenordnungsmäßig mit den Befunden anderer Autoren, welche Tracer-Methoden angewendet hatten (51%; N=4), gut überein und beweisen damit die Brauchbarkeit der Methode.
    Notes: Abstract After extraction of all F-containing substances (intact substance and the sum of all metabolites) from urine (hydrolysed in alkali under heating) of both man and animals after administration of flufenamic acid and derivatives, the balance of excretion can be determined. After alkaline oxydative degradation (Wurzschmitt bomb) of these extracts and distillation in the presence of sulphuric acid and SiO2 the distillates were investigated colorimetrically at pH 4.35 after addition of an alizarine-3-methylamino-N,N-diacetic-cerium(III) complex. Measurements in the range of ≤1 μg per sample used are possible. The results obtained for the renal elimination of flufenamic acid and metabolites in man (49.4±4.6%; N=10) are in concordance with the results of other authors who used tracer methods (51%; N=4) and prove the practicability of this method.
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    URL: http://dx.doi.org/10.1007/BF00431326
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    Application of orthogonal functions to the determination of dihydrocodeine in presence of noscapine (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 282-285 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Dihydrocodein neben Noscapin ; Spektralphotometrie ; Anwendung von Orthogonalfunktionen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die direkte photometrische Bestimmung von Dihydrocodeinbitartrat (5 mg) neben der Hauptkomponente Noscapin (Narcotin)-hydrochlorid (25 mg) ohne Abtrennung gelingt, wenn zur Auswertung Orthogonalpolynome herangezogen werden. Eine andere Methode basiert auf der Fällung der Noscapinbase mit gesättigter Natriumacetatlösung. Auch in diesem Fall wird das Dihydrocodein über Orthogonalfunktionen bestimmt, um den Restanteil von Noscapin zu eliminieren und eventuell störende unspezifische Untergrundabsorptionen auszuschließen. Die Standardabweichung beträgt 1,56 ohne Abtrennung und 0,66 bei Fällung des Noscapins.
    Notes: Summary The orthogonal function method is applied to the determination of dihydrocodeine bitartrate as a minor component (5 mg) in presence of noscapine hydrochloride (25 mg) without separation. Another method based upon precipitating noscapine by a saturated solution of sodium acetate is also presented. Dihydrocodeine is determined in the filtrate using the orthogonal function method to correct for the unprecipitated fraction of noscapine. Standard deviation is 1.56 and 0.66 for direct and precipitation methods, respectively.
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    URL: http://dx.doi.org/10.1007/BF00431327
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