萃取与共沉淀相结合中子活化法测定水中As(Ⅲ)和As(Ⅴ)

Determination of As(Ⅲ) and As(Ⅴ) in water samples by NAA after extraction and coprecipitation

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 neutron activation analysis of As(Ⅲ) and As(Ⅴ) contents in water samples is described. A separation method of inorganic arsenic As(Ⅲ) and As(Ⅴ) in water is studied using 76 As as an indicator. The APDC-CCl 4 extraction system is used in the separation of As(Ⅲ) and As(Ⅴ), and inorganic arsenic in water samples is then coprecipitated by Fe(OH) 3. After filtering and parching the collected sediment can be analyzed by NAA directly.