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  • 1
    Electronic Resource
    Electronic Resource
    Multiple sensor response in segmented flow analysis with ion-selective electrodes (1990)
    s.l. : American Chemical Society
    Analytical chemistry 62 (1990), S. 1015-1019 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00209a004
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  • 2
    Electronic Resource
    Electronic Resource
    Representation and matching of chemical structures by a Prolog program (1989)
    s.l. : American Chemical Society
    Journal of chemical information and modeling 29 (1989), S. 51-60 
    Details
    ISSN: 1520-5142
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ci00062a002
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  • 3
    Electronic Resource
    Electronic Resource
    Field stimulated exoelectron emission from borosilicate glass (1982)
    [s.l.] : Nature Publishing Group
    Nature 297 (1982), S. 42-43 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Electron emission from borosilicate glass under the influence of a strong electric field was first demonstrated by Hibbert and Robertson6'7. The emission current was continuous, noisy, of low intensity, and occurred from discrete 'active sites' on the glass surface. Further work8 revealed that the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/297042a0
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of Tetra-N-substituted 1,10-dioxa-4,7,13,16- tetraazacyclooctadecanes and their Application as Lead (II) Selective Electrodes. X-ray Crystal Structure of 4,7,13,16-tetrathenoyl-1,10- dioxa-4,7,13,16-tetraazacyclooctadecane (1999)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 33 (1999), S. 135-148 
    Details
    ISSN: 1573-1111
    Keywords: ion-selective membrane electrodes ; ionophores ; crystal structure ; tetraazacrown ethers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tetra-N-substituted 1,10-dioxa-4,7,13,16-tetraazacyclooctadecanes (tetraazacrown ethers) (1-5) have been synthesised. Each compound was incorporated in a PVC membrane that provided the basis for a lead-selective potentiometric electrode. The electrode based on the 4,7,13,16-tetrathenoyl-1,10-dioxa-4,7,13,16- tetraazacyclooctadecane (5) ionophore bearing four thenoyl functional subunits exhibited excellent lead (II) ion selectivity with only Ag+ and Hg2+ significantly interfering. The crystal structure of this host (5) has been determined by single crystal X-ray analysis. Crystal data. C32H36N4O6S4, M 700.9, monoclinic, space group P21/c, a, 10.315(4), b, 13.635(2), c, 14.357(6)Å, β 124.63(2)°, V 1661.6(9)Å3, Dc 1.40 g cm-3, Z 2, μ Cu 29.90 cm-1. Final residuals R, Rw were 0.054, 0.082 for the observed data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008080423071
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanism of the hydrolysis of adenosine 5′-triphosphate: A regression analysis of kinetic data (1989)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 3 (1989), S. 569-577 
    Details
    ISSN: 0886-9383
    Keywords: ATP hydrolysis ; Regression analysis ; Model discrimination ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Data of the hydrolysis of adenosine 5′-triphosphate have been re-evaluated using a computer program that numerically integrates the differential rate equations within a routine that optimizes rate coefficients given a suitable model and concentration versus time data.The model is tested by calculation of Hamilton R-values, the Fisher F-statistic, a sensitivity analysis, the standard errors on the rate coefficients and by constructing contour maps of the objective function versus two rate coefficients.An optimization using only phosphate concentration data cannot distinguish between a model in which adenosine 5′-monophosphate is formed predominantly directly with a molecule of pyrophosphate, and one in which it is formed via adenosine 5′-diphosphate. A more accurate set of rate coefficients is calculated from existing data and the relative importance of the two paths determined.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180030405
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  • 6
    Electronic Resource
    Electronic Resource
    A portable flow injection analyzer for use with ion-selective electrodes (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 1118-1120 
    Details
    ISSN: 1040-0397
    Keywords: Portable instrumentation ; Battery powered ; Flow injection ; Iodide ion-selective electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A battery powered portable monitor based on flow injection potentiometry has been developed weighing 1.8 kg, constructed in a carry-case and applicable for remote site monitoring. Portability has been achieved using a light weight rechargeable Ni-Cd battery-pack (7.2 V). The flow injection manifold incorporates a low powered peristaltic pump, a wall-jet type flow cell containing a commercial iodide ion-selective electrode and a Ag/AgCl reference electrode connected to an analog-to-digital converter, also powered by the battery pack, and a RS232-serial output to a notebook computer for real-time data display and storage. The system performance has been evaluated using the iodide ion-selective electrode, including the effects of various carrier solutions on sample peak heights, peak widths and the calibration slopes and working ranges. Fast response with peak widths as low as approximately 10 s. was observed with near Nernstian response of -53.8 mV change per activity decade and a log-linear range between 5 × 10-6 and 1 × 10-2M in a 0.1 M sodium acetate carrier stream.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140071204
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  • 7
    Electronic Resource
    Electronic Resource
    Flow injection, amperometric determination of ethanol in wines after solid-phase extraction (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 541-543 
    Details
    ISSN: 1040-0397
    Keywords: Amperometric detection ; Solid-phase extraction ; Flow injection analysis ; Nickel electrode ; Ethanol ; Wine analysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ethanol in wines was determined by flow injection analysis with an amperometric detector using an oxidized nickel wire. Solid-phase extraction with a strong anion exchanger was used to remove interferences such as organic acids from the matrix, and the residue of the extraction was injected directly into the FIA system. The recoveries of ethanol from wines spiked with standards ranged from 101% to 103%. The response of the nickel electrode to ethanol is dependent on the applied potential and the pH of the carrier. The optimal conditions for the detection of ethanol were an applied potential of +0.60 V (vs. Ag/AgCl) in a carrier of 100 mM sodium hydroxide solution. The electrode exhibited a linear response from 10-5 to 10-3 M, with a detection limit of 1 × 10-6 M. The method was demonstrated by the determination of ethanol in wines.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090707
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  • 8
    Electronic Resource
    Electronic Resource
    The determination of ethanol in wine by voltammetry with an internal standard (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 544-548 
    Details
    ISSN: 1040-0397
    Keywords: Ethanol oxidation ; Cyclic voltammetry ; Osteryoung square-wave voltammetry ; Internal standard ; Wine analysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A rapid method for the electroanalysis of ethanol is presented that incorporates flow extraction at room temperature, with voltammetric detection and potassium ferrocyanide [K4Fe(CN)6] as internal standard. In 0.1 M NaOH electrolyte, ethanol was oxidised at a platinum comb-shaped working electrode at -300 mV (vs. a Ag/AgCl reference electrode) and K4Fe(CN)6 was oxidized at +180 mV. The ratio of the anodic peak currents was linear with ethanol concentration in the range of 0.1 to 8.0% (v./v.), and the detection limit (calculated as 3 σ background) was 0.012 % (v./v.) for Osteryoung square wave voltammetry (OSWV) and 0.023 %(v./v.) for cyclic voltammetry (CV). The average extraction efficiency of ethanol from aqueous solutions, at 20 ± 1°C, was 8.5%. The repeatability was in the range of 2.5 to 3.3% RSD (n = 8), and accuracy was in the range of 95.2 to 104.7% for the determination of wine samples. Application to wines compared well with GC and HPLC methods and the nominal ethanol concentration determined by gravimetry. Analytical parameters in CV and OSWV are optimized, and the dependence of the extraction efficiency with temperature and nitrogen gas flow is presented.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090708
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  • 9
    Electronic Resource
    Electronic Resource
    A photo-cured coated wire potassium ion-selective electrode for use in flow injection potentiometry (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 813-817 
    Details
    ISSN: 1040-0397
    Keywords: Photo-cured membranes ; Potassium ion-selective electrode ; Coated wire electrode ; Flow injection potentiometry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A potassium ion selective electrode (ISE) is reported based on the epoxyacrylate polymer prepared from o-nitrophenyl octyl ether as the plasticizer and 2,2′-bis [3,4-(15-crown-5-)-2-nitrophenylcarbamoxymethyl]tetradecane (BME-44) as the ionophore. Several different electrodes were studied by photo-curing different membranes onto a silver wire (0.8 mm i.d.), and the response characteristics were evaluated. The membranes prepared exhibited strong adhesion to the metal substrate and showed improved mechanical strength compared to poly(vinyl chloride)-based membranes. The sensor exhibited Nernstian response over a log-linear range of between 0.01 mM and 100 mM, and was selective against the common interfering ions. Fast response reaching 90% of steady-state value in 5 s makes this sensor applicable for flow injection potentiometry measurements. The potassium ISE allows for accurate determinations of potassium in various water samples by flow injection potentiometry.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140091102
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of aluminum ions by indirect potentiometry in a flow system (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 990-995 
    Details
    ISSN: 1040-0397
    Keywords: Flow analysis ; Aluminum wire ; Aluminum determination ; Indirect determination ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A potentiometric system is described for the indirect flow determination of Al3+ with an aluminum wire as indicator electrode. The method is based on the reaction between aluminum and fluoride ions at pH 5.0 in acetate buffer. The reduction in activity of fluoride ions is detected by the aluminum electrode. The response was optimized for the flow rate of solution, length of reaction tubing, concentration of fluoride reagent, and pH of the buffer. The response was linear with concentration of aluminum in the range of 0.5 to 50 ppm with a relative standard deviation (RSD) of 0.7%. There was negligible interference from a range of cations and anions when their concentrations were less than 20 ppm.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140061112
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