Abstract：The gold electrode with active surface at side was used as working electrode. The determination method of arsenic in calcium aluminate for water treatment agent by differential pulse anodic stripping voltammetry was established. The calcium aluminate powder for water treatment agent was dissolved in aluminum chloride solution by heating reflux. After filtration,the filtrate was diluted and determined by differential pulse anodic stripping voltammetry with 18% (mass fraction) hydrochloric acid as supporting electrolyte. The results showed that arsenic exhibited a sensitive stripping peak on gold electrode with peak potential about +0.09V. The height of this peak had good linearity to the mass concentration of arsenic in range of 0.5-10μg/L. The correlation coefficient was 0.9977. The detection limit of method was 0.15μg/L. The calcium aluminate sample for water treatment agent was determined according to the experimental method, and the standard solution of arsenic was added for recovery test. The results were were consist with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The recoveries of standard addition were between 90% and 102%. The relative standard deviations (RSD, n=6) of determination results of three calcium aluminate sample for water treatment agent were between 2.1% and 3.3%.
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