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Inorganic arsenic speciation in water and seawater by anodic stripping voltammetry with a gold microelectrode.
Anal Chim Acta. 2007 Mar 07; 585(2):312-22.AC

Abstract

The determination of arsenic in sea and freshwater by anodic stripping voltammetry (ASV) was revisited because of problems related to unstable peaks and inconveniently strong acidic conditions used by existing methods. Contrary to previous work it was found, that As(III) can be determined by ASV using a gold microwire electrode at any pH including the neutral pH typical for natural waters. As(V) on the other hand, requires acidification to pH 1, but this is still a much milder condition than used previously. This is the basis of a new method for the chemical speciation of arsenic in natural waters. The limits of detection are 0.2 nM As(III) at pH 8 and 0.3 nM combined arsenic (III+V) at pH 1 with a 30 s deposition time. These limits are lowered by extending the deposition time. The detection step at pH 8 was stripping chronopotentiometry (SC) as this was found to give a lower detection limit than ASV. Copper is co-determined simultaneously with arsenic. The method was applied successfully to the determination of arsenic as well as copper in samples from the Irish Sea, mineral water and tap water.

Authors+Show Affiliations

University of Liverpool, Department of Earth and Ocean Sciences, Liverpool L69 3GP, United Kingdom.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17386680

Citation

Salaün, Pascal, et al. "Inorganic Arsenic Speciation in Water and Seawater By Anodic Stripping Voltammetry With a Gold Microelectrode." Analytica Chimica Acta, vol. 585, no. 2, 2007, pp. 312-22.
Salaün P, Planer-Friedrich B, van den Berg CM. Inorganic arsenic speciation in water and seawater by anodic stripping voltammetry with a gold microelectrode. Anal Chim Acta. 2007;585(2):312-22.
Salaün, P., Planer-Friedrich, B., & van den Berg, C. M. (2007). Inorganic arsenic speciation in water and seawater by anodic stripping voltammetry with a gold microelectrode. Analytica Chimica Acta, 585(2), 312-22.
Salaün P, Planer-Friedrich B, van den Berg CM. Inorganic Arsenic Speciation in Water and Seawater By Anodic Stripping Voltammetry With a Gold Microelectrode. Anal Chim Acta. 2007 Mar 7;585(2):312-22. PubMed PMID: 17386680.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Inorganic arsenic speciation in water and seawater by anodic stripping voltammetry with a gold microelectrode. AU - Salaün,Pascal, AU - Planer-Friedrich,Britta, AU - van den Berg,Constant M G, Y1 - 2007/01/10/ PY - 2006/10/10/received PY - 2006/12/15/revised PY - 2006/12/22/accepted PY - 2007/3/28/pubmed PY - 2007/7/7/medline PY - 2007/3/28/entrez SP - 312 EP - 22 JF - Analytica chimica acta JO - Anal Chim Acta VL - 585 IS - 2 N2 - The determination of arsenic in sea and freshwater by anodic stripping voltammetry (ASV) was revisited because of problems related to unstable peaks and inconveniently strong acidic conditions used by existing methods. Contrary to previous work it was found, that As(III) can be determined by ASV using a gold microwire electrode at any pH including the neutral pH typical for natural waters. As(V) on the other hand, requires acidification to pH 1, but this is still a much milder condition than used previously. This is the basis of a new method for the chemical speciation of arsenic in natural waters. The limits of detection are 0.2 nM As(III) at pH 8 and 0.3 nM combined arsenic (III+V) at pH 1 with a 30 s deposition time. These limits are lowered by extending the deposition time. The detection step at pH 8 was stripping chronopotentiometry (SC) as this was found to give a lower detection limit than ASV. Copper is co-determined simultaneously with arsenic. The method was applied successfully to the determination of arsenic as well as copper in samples from the Irish Sea, mineral water and tap water. SN - 1873-4324 UR - https://www.unboundmedicine.com/medline/citation/17386680/Inorganic_arsenic_speciation_in_water_and_seawater_by_anodic_stripping_voltammetry_with_a_gold_microelectrode_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0003-2670(07)00010-4 DB - PRIME DP - Unbound Medicine ER -