Determination of As(III) and total as in water by graphite furnace atomic absorption spectrometry after electrochemical preconcentration on a gold-plated porous glassy carbon electrode |
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Authors: | M St?elec F ?acho A Manová E Beinrohr |
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Institution: | (1) Faculty of Chemical and Food Technology, Institute of Analytical Chemistry, Slovak Technical University, Radlinského 9, 812 37 Bratislava, Slovakia |
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Abstract: | Arsenic(III) was preconcentrated in a flow-through electrochemical cell on a gold coated porous carbon electrode. On stripping,
arsenic was eluted with diluted nitric acid and determined off-line by GF AAS. The deposition and stripping steps were optimized.
The limit of detection and limit of quantification were found to be 1.9 μg L−1 and 6.4 μg L−1, respectively. The repeatability and reproducibility were found to be 5.3 % and 9.3 %, respectively. Total arsenic was determined
after a microwave assisted chemical reduction of As(V) to As(III) making the procedure suitable for speciation analysis. The
method was applied in analysis of water samples. |
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Keywords: | electrochemical preconcentration speciation arsenic flow-through cell GF AAS |
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