109 research outputs found

    Determination of chlorinated solvents in industrial water and wastewater by DAI–GC–ECD

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    A very simple and quick analytical method, based on direct aqueous injection, for determination of halogenated solvents in refinery water and wastewater, is described. There is a need to determine halogenated solvents in refinery water streams, because they may originate from several processes. There is also a need to develop methods enabling VOX to be determined in samples containing oil fractions. The method described enables simultaneous determination of 26 compounds with low detection limits (sub-μg L−1) and excellent precision, especially for highly halogenated solvents. The matrix effects of four types of sample were evaluated—the method seemed to be relatively insensitive to variations in matrix composition. Deuterated 1,2-dichloroethane was used as internal standard and surrogate compound in quantitative analysis; application of isotopically labelled compounds is rarely reported when non-mass spectrometric detectors are used for analysis. Analysis of real samples showed that the most frequently detected compounds were dichloromethane and 1,2-dichloroethane

    Transformation of Biomass into Commodity Chemicals Using Enzymes or Cells

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    Mit der Optimalisierung der Aktivierungsanalyse bin�rer Systeme

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    Das Chromatomassenspektrometer ?Chromass-2? f�r Untersuchungen organischer Gemische unbekannter Zusammensetzung

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    Die colorimetrische Jodbestimmung in Wasser und Salzlake

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    Massenspektrometrische Bestimmung von Deuterium in biologischen Proben

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    Eine quantitative IR-spcktroskopische Untersuchung von Sevin und Gemischen der Sevinherstellung

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    Massenspektrometrische Untersuchung von Monosilan und -german

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    Neutronenaktivierungsanalytische Bestimmung von Wismut in Mineralien

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