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Chromium speciation in natural waters using serially connected supported liquid membranes.

Djane, N K; Ndung'u, K; Johnsson, Carin; Sartz, H; Tornstrom, T and Mathiasson, Lennart LU (1999) In Talanta 48(5). p.1121-1132
Abstract
A supported liquid membrane (SLM) method for the speciation of chromium has been developed. The method is based on selective extraction and enrichment of anionic Cr(VI) and cationic Cr(III) species in two serially connected SLM units. Methyltricaprylammonium chloride (Aliquat) and di-(2-ethylhexyl) phosphoric acid (DEHPA), respectively were used as the selective extractants in the membrane liquid. Graphite furnace atomic absorption spectrometry (GFAAS) was utilised for final determination. Optimised conditions for the DEHPA membrane were, sample solution at pH 3, acceptor solution 0.1 M HNO(3) and 10% w/w carrier in kerosene. The corresponding values for the Aliquat membrane were pH 7, 0.75 M HNO(3) and 6% w/w carrier in di-n-hexylether.... (More)
A supported liquid membrane (SLM) method for the speciation of chromium has been developed. The method is based on selective extraction and enrichment of anionic Cr(VI) and cationic Cr(III) species in two serially connected SLM units. Methyltricaprylammonium chloride (Aliquat) and di-(2-ethylhexyl) phosphoric acid (DEHPA), respectively were used as the selective extractants in the membrane liquid. Graphite furnace atomic absorption spectrometry (GFAAS) was utilised for final determination. Optimised conditions for the DEHPA membrane were, sample solution at pH 3, acceptor solution 0.1 M HNO(3) and 10% w/w carrier in kerosene. The corresponding values for the Aliquat membrane were pH 7, 0.75 M HNO(3) and 6% w/w carrier in di-n-hexylether. This gave extraction efficiencies for Cr(III) and Cr(VI) of 90 and 40%, respectively. The method was used to measure the concentration of Cr III and Cr VI in surface water from an abandoned tannery site. Storage experiments at different pH showed that preservation at neutral pH gave almost constant values over a period of one month. At acidic pH (pH=3.0) the concentration of Cr(VI) decreased rapidly while the concentration of Cr(III) increased. The detection limit, expressed as three times the standard deviation of enriched blank samples was 0.01 mug l(-1). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Preconcentration, Chromium supported liquid membrane (SLM), Speciation
in
Talanta
volume
48
issue
5
pages
1121 - 1132
publisher
Elsevier
external identifiers
  • pmid:18967556
  • scopus:0033013341
ISSN
1873-3573
DOI
10.1016/S0039-9140(98)00334-8
language
English
LU publication?
yes
id
8461a9bc-5529-4aba-b78b-48fbced96521 (old id 1261771)
date added to LUP
2008-12-01 11:29:11
date last changed
2017-01-01 07:09:49
@article{8461a9bc-5529-4aba-b78b-48fbced96521,
  abstract     = {A supported liquid membrane (SLM) method for the speciation of chromium has been developed. The method is based on selective extraction and enrichment of anionic Cr(VI) and cationic Cr(III) species in two serially connected SLM units. Methyltricaprylammonium chloride (Aliquat) and di-(2-ethylhexyl) phosphoric acid (DEHPA), respectively were used as the selective extractants in the membrane liquid. Graphite furnace atomic absorption spectrometry (GFAAS) was utilised for final determination. Optimised conditions for the DEHPA membrane were, sample solution at pH 3, acceptor solution 0.1 M HNO(3) and 10% w/w carrier in kerosene. The corresponding values for the Aliquat membrane were pH 7, 0.75 M HNO(3) and 6% w/w carrier in di-n-hexylether. This gave extraction efficiencies for Cr(III) and Cr(VI) of 90 and 40%, respectively. The method was used to measure the concentration of Cr III and Cr VI in surface water from an abandoned tannery site. Storage experiments at different pH showed that preservation at neutral pH gave almost constant values over a period of one month. At acidic pH (pH=3.0) the concentration of Cr(VI) decreased rapidly while the concentration of Cr(III) increased. The detection limit, expressed as three times the standard deviation of enriched blank samples was 0.01 mug l(-1).},
  author       = {Djane, N K and Ndung'u, K and Johnsson, Carin and Sartz, H and Tornstrom, T and Mathiasson, Lennart},
  issn         = {1873-3573},
  keyword      = {Preconcentration,Chromium supported liquid membrane (SLM),Speciation},
  language     = {eng},
  number       = {5},
  pages        = {1121--1132},
  publisher    = {Elsevier},
  series       = {Talanta},
  title        = {Chromium speciation in natural waters using serially connected supported liquid membranes.},
  url          = {http://dx.doi.org/10.1016/S0039-9140(98)00334-8},
  volume       = {48},
  year         = {1999},
}