Abstract
This study discussed a method for the determination of inorganic arsenic in arsenic compounds and dimethylarsonic acid (DMA) mixture by AAS after benzene extraction. The ion associate of arsenic(III) was extracted with benzene from hydrochloric acid solution (1012 M) but neither arsenic(V) nor DMA were extracted. Titanium chloride(III) dissolved in concentrated hydrochloric acid was used to reduce arsenic(V) to arsenic(III). The reduction of 10 μg of arsenic(V) was carried out by using 2 ml of 10% titanium chloride (III) solution at 60°C for 30 min. As a result, the arsenic (V) was completely reduced to arsenic(III) but the reduction of DMA was negligible. This method was applied to the determination of arsenic ion in oxidation degradation reaction products of wastewater containing DMA. The detection limit was 1 μg/l and the relative standard deviation was 1.8% at 30 μg/l.
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