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Inorganic arsenic speciation in water and seawater by anodic stripping voltammetry with a gold microelectrode

Title data

Salaun, Pascal ; Planer-Friedrich, Britta ; van den Berg, Constant M. G.:
Inorganic arsenic speciation in water and seawater by anodic stripping voltammetry with a gold microelectrode.
In: Analytica Chimica Acta. Vol. 585 (2007) Issue 2 . - pp. 312-322.
ISSN 1873-4324
DOI: https://doi.org/10.1016/j.aca.2006.12.048

Abstract in another language

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 0.2nM As(III) at pH 8 and 0.3nM 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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER80722
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 06 May 2015 14:57
Last Modified: 06 May 2015 14:57
URI: https://eref.uni-bayreuth.de/id/eprint/12979