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以７６Ａｓ为指示剂研究了水中无机Ａｓ（Ⅲ）和Ａｓ（Ⅴ）的分离方法，并用中子活化法测定了井水中Ａｓ（Ⅲ）和Ａｓ（Ⅴ）的含量。ＡＰＤＣ－ＣＣｌ４有机螯合萃取体系可用于水中Ａｓ（Ⅲ）和Ａｓ（Ⅴ）的分离。水中无机砷能以盐基砷酸铁的形式被Ｆｅ（ＯＨ）３共沉淀富集。沉淀经过滤、烘干可直接用于中子活化分析。
The separation of As (Ⅲ) and As (Ⅴ) from As (Ⅲ) and As (Ⅴ) in water samples was studied with 76As as indicator. The content of As (Ⅲ) and As (Ⅴ) in well water was determined by neutron activation method. APDC-CCl4 organic chelate extraction system can be used for the separation of As (Ⅲ) and As (Ⅴ) in water. Inorganic arsenic in water can be iron-based ferric arsenate in the form of Fe (OH) 3 coprecipitation enrichment. Precipitate by filtration, drying can be used directly for neutron activation analysis.