Flow injection sorbent extraction with dialkyldithiophosphates as chelating agent for the determination of zinc by flame atomic absorption spectrometry

Renli Ma, Willy Van Mol, Freddy Adams*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Dialkyldithiophosphates, (RO)2P(S)S-, were used as the complexing agent for flow injection on-line sorbent extraction for the determination of zinc by flame atomic absorption spectrometry. The extractability with diethyl-, di-n-propyl-, di-2-propyl-, di-n-butyl-, di-isobutyl-, di-sec.-butyl-, di-n-pentyl- and di-n-hexyldithiophosphates was compared in respect of the effects of pH, alkyl group, masking agent and reagent concentration. Di-sec.-butyldithiophosphate (0.5%, m/v) at pH 3 with 0.1 M citrate as a masking agent for iron, was used for the determination of zinc in a number of certified biological and environmental reference materials from the Community Bureau of Reference (BCR). All analytical results were in good agreement with the certified values. The detection limit (3σ) of peak height measurement, using a flow spoiler in the spray chamber, was 0.5 μg l-1 with an enhancement factor of 35 for a 20-s sample loading at 8.7 ml min-1.

Original languageEnglish
Pages (from-to)395-403
Number of pages9
JournalAnalytica Chimica Acta
Volume309
Issue number1-3
DOIs
Publication statusPublished - 20 Jun 1995
Externally publishedYes

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