Differential reduction and atomic absorption determination of selenium

undertake such interlaboratory comparisons with sediment samples in the future, especially as new methods are developed and applied to environmental analyses. Such studies are needed to determine when different numbers generated by different laboratories using different methods are environmentally significant.If nothing else, the results of this intercomparison study should serve as a warning against overinterpretation of currently generated trace-level hydrocarbon determinations. The results should not be used as an argument against further intercomparison exercises, but should be used as encouragement for the continued development of the state-of-the-art of trace organic analysis. Ultimately, the goal of the National Bureau of Standards is to produce a Standard Reference Material with certified trace-level concentrations of environmentally significant organic compounds in a "real" matrix. Unfortunately, methods for preparing and certifying such a material have not yet been developed. Problems associated with sample homogeneity, stability, matrix effects, etc. must also be resolved before any such standard can become available. The low concentration of hydrocarbons anticipated in many pollution baseline studies necessitates the development of sensitive analytical techniques. Finally, some form of information exchange or intercomparison must exist among laboratories in order to assess the uncertainty of the data from these new analytical techniques.

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Behaviour of the Different Oxydation States of As, Sb, Se and Sn Using Dithiocarbamates for Their Separation from Environmental, Food and Drug Samp1es

Seltner¹,

Linder²,

Schreiber³

1981

International Journal of Environmental Analytical Chemistry

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The mentioned elements are known to occur in the environment in different oxydation states with different biological activities. Speciation of the oxydation state by selective enrichment can lead to relevant information for the toxicologist. A sample treatment procedure is described that --allows to discriminate between the oxidation states of the mentioned elements --converts the elements to the optimum oxydation state for enrichment from the sample --brings the elements in an ideal form for their determination by x-ray fluorescence analysis using coprecipitation with the dibenzyl-ammoniumsalt of dibenzyldithiocarbamic acid. An outline of the method, instrumentation used and applications to organic, biological and environmental samples is given.

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Differential reduction and atomic absorption determination of selenium

Cited by 3 publications

References 8 publications

Selenium in environmental waters: Determination, speciation and concentration levels

Selenium in environmental waters: Determination, speciation and concentration levels

Indirect determination of selenium in sodium selenate

Behaviour of the Different Oxydation States of As, Sb, Se and Sn Using Dithiocarbamates for Their Separation from Environmental, Food and Drug Samp1es

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