Comparison of different pre-concentration methods for the determination of trace levels of arsenic, cadmium, copper, mercury, lead and selenium

1 January 1989

journal article
research article
Published by Royal Society of Chemistry (RSC) in The Analyst

Vol. 114 (9) , 1113-1117
https://doi.org/10.1039/an9891401113

Abstract

Three methods have been considered for trace metal concentration: (a) liquid-liquid extraction using either ammonium pyrrolidinedithiocarbamate or 8-hydroxyquinoline-5-sulphonic acid; (b) the use of a synthetic poly(dithiocarbamate) resin; and (c) reductive precipitation with NaBH₄. The suitability of method (a) for the determination of metal ions in samples with a complex matrix and high salinity has been investigated. Method (b) was especially useful for speciation studies of trace levels of As^III, As^V, Se^IV and Se^VI. Method (c) gave 1000-fold pre-concentration factors with total recoveries.

Keywords

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