Flow injection sorbent extraction with dialkyldithiophosphates as chelating agent for nickel, cobalt and manganese determination by atomic absorption spectrometry

Renli Ma, Freddy Adams*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

Using octadecyl functional group (C18) bonded silica gel as sorbent and methanol or ethanol as eluent, the extractability of nickel, cobalt and manganese with diethyl-, di-n-propyl-, di-2-propyl-, di-n-butyl-, di-isobutyl-, di-2-butyl-, di-n-pentyl- and di-n-hexyldithiophosphates, (RO)2P(S)S-, was investigated in respect of the effects of pH, alkyl substituent group, reagent concentration and masking agent by flame atomic absorption spectrometry. The extractability increases with the chain length of the substituent groups in the reagents and is quantitative for alkyl groups larger than butyl at pH ca. 3. At a high concentration of di-n-pentyldithiophosphate, the metals are selectively extracted from coexisting cadmium, copper, lead and iron. As an analytical demonstration, di-n-pentyldithiophosphate was used for the determination of ultra-trace concentrations of nickel in two certified reference saline water samples (sea water and estuarine water) by graphite furnace atomic absorption spectrometry. Results were in good agreement with the certified values. The detection limit (3σ) of peak area measurement was 0.07 μg l-1 with an enrichment factor of 10 for nickel with 20-s sample loading at 8.7 ml min-1 and 20-μl eluate injection.

Original languageEnglish
Pages (from-to)215-222
Number of pages8
JournalAnalytica Chimica Acta
Volume317
Issue number1-3
DOIs
Publication statusPublished - 20 Dec 1995
Externally publishedYes

Keywords

  • Atomic absorption spectrometry
  • Cobalt
  • Dialkyldithiophosphates
  • Flow injection
  • Manganese
  • Nickel
  • Waters

Fingerprint

Dive into the research topics of 'Flow injection sorbent extraction with dialkyldithiophosphates as chelating agent for nickel, cobalt and manganese determination by atomic absorption spectrometry'. Together they form a unique fingerprint.

Cite this