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用酒石酸盐和氰化物联合掩蔽银、铜、铁等离子,以PAN为指示剂,用EDTA直接滴定含铟14%左右的银铜钢合金,方法简便。分析方法: 取0.1克试样,用硝酸(1+1)5毫升低温溶解后继续蒸至近干(勿焦),加2M NH_4Ac溶液(pH7)30毫升,溶解盐类,加酒石酸钾钠1克,摇匀,溶解后加氰化钾(5%)5毫升,PAN(0.1%)乙醇溶液3滴,
Tartrate and cyanide combined with silver, copper, iron plasma, PAN as an indicator, with EDTA direct titration of about 14% indium containing silver copper steel alloy, the method is simple. Analysis: Take 0.1 g sample, with nitric acid (1 +1) 5 ml of low temperature dissolved and then continue to steamed to near dry (do not coke), add 2M NH 4 Ac solution (pH7) 30 ml, dissolved salts, plus sodium potassium tartrate 1 g , Shake, dissolve and add 5 ml of potassium cyanide (5%), 3 drops of PAN (0.1%) ethanol solution,