在0.06 mol/L硫酸介质中,砷(Ⅴ)与钼酸铵形成砷钼杂多酸,在表面活性剂聚乙烯醇存在的条件下,砷钼杂多酸可以和甲基绿生成可溶于水的离子缔合物,该缔合物在655 nm处有最大吸收,据此建立了一种简单、快速的流动注射-分光光度法在线测定环境水中砷(Ⅴ)的方法.砷的质量浓度在5.0～240.0μg/L范围内符合比尔定律,检出限为0.442μg/L(3倍基线噪音).对含量为160.0μg/L的砷标准溶液进行14次平行测定,其相对标准偏差为1.6%.本方法具有良好的选择性(SiO32-、PO43-对测定有干扰,加入草酸和柠檬酸作掩蔽剂,可消除其干扰),用于环境水样分析,回收率为93%～108%.
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