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Talanta. 2014 Oct;128:466-72. doi: 10.1016/j.talanta.2014.04.035. Epub 2014 Apr 30.

Determination of arsenic speciation in sulfidic waters by Ion Chromatography Hydride-Generation Atomic Fluorescence Spectrometry (IC-HG-AFS).

Author information

1
Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland. Electronic address: nic@hi.is.
2
Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland.
3
Reykjavik Energy, Bæjarhals 1, 110 Reykjavik, Iceland.

Abstract

A method for the analysis of arsenic species in aqueous sulfide samples is presented. The method uses an ion chromatography system connected with a Hydride-Generation Atomic Fluorescence Spectrometer (IC-HG-AFS). With this method inorganic As(III) and As(V) species in water samples can be analyzed, including arsenite (HnAs(III)O3(n-3)), thioarsenite (HnAs(III)S3(n-3)), arsenate (HnAs(V)O4(n-3)), monothioarsenate (HnAs(V)SO3(n-3)), dithioarsenate (HnAs(V)S2O2(n-3)), trithioarsenate (HnAs(V)S3O(n-3)) and tetrathioarsenate (HnAs(V)S4(n-3)). The peak identification and retention times were determined based on standard analysis of the various arsenic compounds. The analytical detection limit was ~1-3 µg L(-1) (LOD), depending on the quality of the baseline. This low detection limit makes this method also applicable to discriminate between waters meeting the drinking water standard of max. 10 µg L(-1) As, and waters that do not meet this standard. The new method was successfully applied for on-site determination of arsenic species in natural sulfidic waters, in which seven species were unambiguously identified.

KEYWORDS:

Arsenic speciation; Geothermal fluids; Hydride Generation Atomic Fluorescence Spectrometry; Ion chromatography; On-site chemical analysis

PMID:
25059187
DOI:
10.1016/j.talanta.2014.04.035
[Indexed for MEDLINE]

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