title: Determination of arsenic speciation in sulfidic waters by Ion Chromatography Hydride-Generation Atomic Fluorescence Spectrometry (IC-HG-AFS).
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.
authors: Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland. Electronic address: nic@hi.is.
authors: Nicole S
authors: NS
authors: Keller
authors: Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland.
authors: Andri
authors: A
authors: Stefánsson
authors: Reykjavik Energy, Bæjarhals 1, 110 Reykjavik, Iceland.
authors: Bergur
authors: B
authors: Sigfússon
mesh_terms: D001148:Arsenamide / Q000032:analysis; D001149:Arsenates / Q000032:analysis; D001151:Arsenic / Q000032:analysis*; D018053:Arsenites / Q000032:analysis; D002138:Calibration; D002845:Chromatography / Q000379:methods*; D045482:Hot Springs / Q000032:analysis* / Q000737:chemistry; D007477:Ions; D015203:Reproducibility of Results; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013440:Sulfides / Q000032:analysis* / Q000737:chemistry; D014881:Water Supply / Q000032:analysis / Q000592:standards
chemical_list: D001149:Arsenates; D018053:Arsenites; D007477:Ions; D013440:Sulfides; C015001:arsenite; D001151:Arsenic; C025657:arsenic acid; D001148:Arsenamide
keywords: Arsenic speciation; Geothermal fluids; Hydride Generation Atomic Fluorescence Spectrometry; Ion chromatography; On-site chemical analysis