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砷化物广泛存在于自然界中,在化工、冶炼、制药、炼焦和农药等工厂排放的废水中都含有砷。砷的毒性与其存在形态有关,一般无机砷比有机砷的毒性大;低价砷比高价砷的毒性大。因此,了解砷的形态十分重要。近年来,除监测总砷外还需对砷存在的形态进行分析。我们参考T.Kamada的工作和结合环境污染调查的要求,研究了萃取分离与分光光度法测定水中的As~(3+)与As~(5+)。方法基于As~(3+)和APDC(吡咯烷二硫代甲酸铵)形成的络合物在pH～5.0时定量地被MIBK(甲基异丁基酮)萃取,As~(5+)不被萃
Arsenide exists widely in nature and contains arsenic in wastewater discharged from factories such as chemical industry, metallurgy, pharmaceuticals, coking plants and pesticides. The toxicity of arsenic is related to its existing form. Inorganic arsenic is generally more toxic than organic arsenic. Low-price arsenic is more toxic than high-priced arsenic. Therefore, understanding the shape of arsenic is very important. In recent years, in addition to the monitoring of total arsenic need to analyze the presence of arsenic. With reference to the work of T. Kamada and the requirements of environmental pollution investigation, we studied the extraction and separation and spectrophotometric determination of As ~ (3+) and As ~ (5+) in water. Methods Complexes based on As ~ (3+) and APDC (pyrrolidine dithiocarbamate) were quantitatively extracted with MIBK (methyl isobutyl ketone) at pH ~ 5.0, As ~ (5+) Extracted