目前,直接测定As(Ⅲ)的方法,多采用氧化还原法,但硫化铜精矿氯化物浸出液中含有Fe(Ⅱ)、Cu(Ⅰ)等有影响。其它如萃取分离法及离子交换法等也有报导,但在实际工作中很少应用。本法根据在氢卤酸介质中,As(Ⅲ)的卤化物能被有机溶剂萃取,并在萃取分离少量砷及文献的基础上单独测出浸出液中高达45毫克As(Ⅲ),结果良好。As(Ⅴ)量是基于另一份浸出液中,用蒸馏法测得砷的总量中减去As(Ⅲ)量求得。 At present, the direct determination of As (Ⅲ) method, the use of redox method, but the sulfide copper sulfide leachate containing Fe (Ⅱ), Cu (Ⅰ) and other influential. Other methods such as extraction and ion exchange method are also reported, but rarely used in practical work. This method is based on the halogen acid medium, As (III) halide can be extracted by organic solvents, and in the extraction and separation of arsenic and literature on the basis of a separate measurement of the leachate up to 45 mg As (III), the results were good. The amount of As (V) is based on the amount of As (III) subtracted from the total amount of arsenic measured by distillation in another leachate.