Anodic stripping voltammetry using underpotential deposition allows sub 10 ppb measurement of total As and As(III) in water
We report a sensitive stripping voltammetry method for the detection of total arsenic in aqueous solution using gold macroelectrodes based on the underpotential deposition (UPD) of As ad-atoms. The detection of As(III) or total arsenic can be selectively made by changing deposition potential, with d...
| Main Authors: | , |
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| Format: | Journal article |
| Jezik: | English |
| Izdano: |
Elsevier
2022
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| Izvleček: | We report a sensitive stripping voltammetry method for the detection of total arsenic in aqueous
solution using gold macroelectrodes based on the underpotential deposition (UPD) of As ad-atoms.
The detection of As(III) or total arsenic can be selectively made by changing deposition potential, with
detection of the total As content by deposition at high potential (- 1.3 V) and of As(III) by deposition
at lower potential (- 0.9 V). Linear responses were found for both arsenic species in the range 0.01 μM
to 0.1 μM at gold macroelectrodes. The analytical useful signals were recorded at concentrations as
low as 0.01 μM (0.8 μg L-1
) for both arsenic species suggesting that this method can be used to detect
total arsenic concentrations in drinking water within the threshold value of the WHO of 0.13 μM (10
μg L-1
).
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