原子吸收法连续测定银和镉,曾有过报道,但是,铜、铅、铋、铁、锌等元素有干扰。本法是在盐酸介质中,加入抗坏血酸,使铜还原为一价被硫脲络合,铁也还原为低价;加入酒石酸使铅、锌、铋络合,从而消除共存元素的干扰。本法特点是干扰少,操作简便、结果满意。 Continuous determination of silver and cadmium by atomic absorption has been reported, however, copper, lead, bismuth, iron, zinc and other elements interfere. This method is to add ascorbic acid to hydrochloric acid medium, so that the copper is reduced to monovalent by thiourea complexation and the iron is also reduced to low price; tartaric acid is added to complex the lead, zinc and bismuth so as to eliminate the interference of coexisting elements. This law is characterized by less interference, easy to operate and satisfactory results.