研究了用氯氧化锆共沉淀浓缩水中微量砷 ,用 1+ 1硝酸溶解沉淀 ,在灰化温度 3 0 0℃ ,原子化温度2 2 0 0℃条件下 ,采用石墨炉原子吸收光谱法直接测定水中砷 ,同时对共沉淀时间 ,沉淀剂的用量及其它共存离子的影响等最佳测试条件作了试验。结果表明 ,砷浓度在 0～ 3 0 μg/L 范围内符合比尔定律 ,方法的回收率为90 .0 %～ 97.5 % ,相对标准偏差为 3 .9%～ 5 .7% ,检出限为 0 .1μg/L Arsenic trioxide was co-precipitated with zirconium oxychloride to concentrate trace arsenic in water, and the precipitate was dissolved in 1 + 1 nitric acid. The graphite was determined by graphite furnace atomic absorption spectrometry at an ashing temperature of 300 ℃ and an atomization temperature of 2200 ℃. Arsenic in water was tested simultaneously with the best test conditions such as coprecipitation time, the amount of precipitant and the influence of other coexisting ions. The results showed that the Beer’s law was obeyed in the range of 0 ~ 300 μg / L, the recoveries were 90.0% -97.5% and the relative standard deviations were 3.9% -5.7%. The detection limits were 0 .1 μg / L