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  • 1
    Electronic Resource
    Electronic Resource
    Online Coupling of a Flow-Through Sensor to a Supercritical Fluid Extractor (1995)
    s.l. : American Chemical Society
    Analytical chemistry 67 (1995), S. 1054-1059 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00102a006
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  • 2
    Electronic Resource
    Electronic Resource
    A practical approach to metrology in chemistry and biology (1999)
    Springer
    Accreditation and quality assurance 4 (1999), S. 143-152 
    Details
    ISSN: 1432-0517
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  The inherent difficulties of measurement in chemistry and biology have made it necessary to open discussion forums solely devoted to bench level work. This contribution summarises the conclusions of the Standards, Measurements and Testing Project (SMT4-CT96-6505) of the European Commission, devoted to the application of metrology in chemistry and biology. The objective of this project was to provide orientations and some recommendations which could partially satisfy end-users needs in the near future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007690050335
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  • 3
    Electronic Resource
    Electronic Resource
    Teaching analytical properties (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 202-205 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  A new way of expounding analytical properties based on their mutual dependence (complementary and contradictory relationships) and their unequivocal connection with analytical quality facets is presented. To this end, the paper provides answers to the obvious questions that arise in dealing with the subject: why?, how?, when? and where to teach analytical properties in the Analytical Chemistry curriculum?
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050138
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  • 4
    Electronic Resource
    Electronic Resource
    Direct multiparametric determination of anions in soil samples by integrating on-line automated extraction/filtering with capillary electrophoresis (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 697-701 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An integrated continuous flow-capillary electrophoresis for the determination of soluble anions in soil samples is presented. A filtration probe coupled with the flow system, which is located before the capillary electrophoresis instrument, was designed to simplify sample pretreatment and to perform clean-up of aqueous soil suspensions. Only the manual weighing of the samples is needed. The extraction process for soil samples was optimized. The clear filtrate containing the soluble anions from soil was then passed to the capillary electrophoresis equipment by a home-made programmable arm. Chloride, sulfate, nitrite and nitrate were determined in soil samples at μg g–1 level and the results compared to manual reference methods. The precision expressed as relative standard deviation was in the range of ± 1.6 to ± 2.5% for the set of analytes determined. The procedure is up to 4 times faster than the competitive manual methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050784
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  • 5
    Electronic Resource
    Electronic Resource
    Supercritical fluid extraction of t-resveratrol and other phenolics from a spiked solid (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 143-148 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Supercritical fluid extraction of spiked phenolics including gallic acid, (+)-catechin, (–)-epicatechin, caffeic acid, p-coumaric acid, myricetin, t-resveratrol, quercetin and salicylic acid from an inert support using pure CO2 and methanol-carbon dioxide mixtures was studied. Extraction and collection variables including modifier percentage, extraction temperature, flow rate, extraction time, trap packing and rinse solvent were optimized. The study revealed that the use of methanol as modifier was mandatory. Only the less hydroxylated compounds such as p-coumaric acid, t-resveratrol and salicylic acid could be quantitatively recovered (mean recovery ≥ 95%) from spiked diatomaceous earth. Mean recoveries of more polar phenolic acids and flavonoids such as gallic acid, caffeic acid, catechins and quercetin were between 30% and 70%. Myricetin was not recovered at all.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050851
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  • 6
    Electronic Resource
    Electronic Resource
    Applications of supercritical fluid extraction in food analysis. (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 561-573 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  The state of the art of SFE methods for food samples is reviewed. Typical examples of off-line and chromatography hyphenated SFE methods which have proved useful in food analysis are discussed. Finally, comments are given on expectations and trends for the technique in this field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050471
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  • 7
    Electronic Resource
    Electronic Resource
    Is traceability an exclusive property of analytical results? An extended approach to traceability in chemical analysis (1997)
    Springer
    Fresenius' journal of analytical chemistry 359 (1997), S. 473-475 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The need to adapt the definition of traceability in the Metrological Dictionary of ISO to the growing use of this concept in Analytical Chemistry aroused the broader, more flexible proposal expounded in this paper which aims to be closer to the bench level. The traceability concept is addressed in a hierarchical manner by ranking the different notions to which the qualifier “traceable” applies (results, standards, equipment and samples) in such a way that it is compatible with the ISO definition. Relationships among them and with classical analytical properties are also exposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050615
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  • 8
    Electronic Resource
    Electronic Resource
    Coupling continuous flow systems to instruments based on discrete sample introduction (1998)
    Springer
    Fresenius' journal of analytical chemistry 362 (1998), S. 58-66 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The interfaces between low-pressure continuous sample treatment systems and high-level information instruments such as gas chromatographs, capillary electrophoresis equipment and graphite furnace atomic spectroscopic instruments, which are characterized by conventional discrete sample introduction devices, are presented. The present and future developments are discussed of (directly) linking real samples and those analytical equipments with the main objective of avoiding or minimizing manually implemented preliminary operations of the analytical process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051035
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of the thermophysical properties of polymers (PET) using photoacoustic spectroscopy (1999)
    Springer
    Journal of materials science 34 (1999), S. 2113-2119 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Using photothermal techniques and the Open Photoacoustic Cell (OPC) we measure thermophysical properties, such as thermal diffusivity, thermal conductivity, and heat capacity per unit volume of 5 polymer foils, poly(ethylene terephthalate) PET, of different molecular weights. It is shown that the physical properties influence strongly the thermal ones, and that photoacoustics can be used as a monitoring technique in the application of polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004520128400
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  • 10
    Electronic Resource
    Electronic Resource
    Automatic preconcentration of chlorophenols and gas chromatographic determination with electron capture detection (1996)
    Springer
    Chromatographia 43 (1996), S. 633-639 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Electron capture detection ; Solid phase extraction ; Chlorophenols ; Water analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A solid-phase extraction system coupled to a gas chromatograph fitted with an electron capture detector was developed for the determination of chlorophenols in waters. The continuous system consists of an XAD-2 adsorbent column where chlorinated phenols are preconcentrated and subsequently eluted with ethyl acetate. The sensitivity of the method is proportional to the number of chlorine substituents in the phenol; thus, the detection limit for monochlorophenols is ca. 10 μg L−1 and that for pentachlorophenol about 2 ng L−1. The method was used to determine chlorophenols in treated waters, with good precision; however, no mono or dichlorophenols were detected at the levels afforded by the proposed method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02292980
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