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本法基于用溴化钾掩蔽铋,P-204的正庚烷溶液萃取锌,用稀盐酸反萃取锌后,用双硫腙光度法测定。萃取适宜的酸度为PH>3;p-204浓度1～20%(正庚烷溶液)对萃取没有影响;1克铋需要5克以上的溴化钾掩蔽,高至10克无影响;振摇半分钟可达平衡,一次萃取达98%;用0.5N硝酸反萃取锌,两次可达完全;有机相用25%溴化钾洗两次(每次10毫升)对回收没有影响。在萃取锌的条件下,20微克的Cd、Ni、Co、Pb不
This method is based on the use of potassium bromide masking bismuth, P-204 n-heptane solution extraction of zinc, with dilute hydrochloric acid stripping zinc, with dithizone spectrophotometric determination. Extraction of the appropriate acidity PH> 3; p-204 concentration of 1 to 20% (n-heptane solution) had no effect on the extraction; 1 g bismuth need more than 5 g of potassium bromide masking up to 10 g no effect; Half an hour up to a balance of 98% extraction once; stripping of zinc twice with 0.5 N nitric acid; up to twice complete with 25% potassium bromide in the organic phase (10 ml each) has no effect on recovery. In the extraction of zinc, 20 micrograms of Cd, Ni, Co, Pb are not