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In Search of a Speciation Method for Arsenic in Mine-Influenced Waters: Is Differential Pulse Anodic Stripping Voltammetry the Answer?
Ist Teil von
Mine water and the environment, 2019-12, Vol.38 (4), p.837-846
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2019
Link zum Volltext
Quelle
SpringerLink Journals (MCLS)
Beschreibungen/Notizen
This study investigated whether differential pulse anodic stripping voltammetry (DPASV) with a solid gold electrode could be used for arsenic speciation of mine-influenced water. The DPASV parameters were optimized using a 100-µg L
−1
As(III) standard solution. The procedure for chemical reduction of As(V) to As(III) using thiosulfate prior to DPASV measurements was also optimized. Two samples of mine-influenced waters from the Witwatersrand mining area, an acid mine drainage (AMD) and a more dilute Fleurhof dam water sample, were used to assess the method viability. Interference from elements in the AMD proved insurmountable using this technique alone; the method was also unable to detect arsenic in the dam water sample. However, spiked dam water samples gave percent recoveries of 81.6% and 123% for As(III) and As(V), respectively, showing that arsenic species in mine-influenced water can be effectively determined if the method is reoptimized for lower arsenic concentrations.