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双硫腙褪色法测定微量银已被广泛应用,但对高铅、锑、砷物料一般仍采用火试金及化学法富集消除共存元素的干扰。本文采用乳酸-EDTA掩蔽共存元素的干扰,在pH4—5的乙酸-乙酸钠介质中加入过量一定量的双硫腙四氯化碳溶液,萃取,光电比色测定过量双硫腙并换算出银量。试验表明,在20毫升乳酸(1+3)及5毫升20%EDTA溶液联合掩蔽剂存在下,下列元素(毫克)Cu(300);Sb(150);Pb(100);As(15);Sn(10);Fe、Te(5);Zn(0.25);Tl(0.20);Pt(0.01);Au、In(0.005);
Dithizone fading method for the determination of trace silver has been widely used, but for high lead, antimony and arsenic materials are generally still using fire test gold and chemical enrichment to eliminate the interference of coexisting elements. In this paper, the interference of coexisting elements was masked by lactic acid-EDTA. An excess amount of dithizone carbon tetrachloride solution was added into the acetic acid-sodium acetate solution at pH4-5, and the excess dithizone was extracted by photoelectric colorimetry and the silver the amount. The test showed that the following elements (mg) Cu (300); Sb (150); Pb (100); As (15); in the presence of 20 ml of lactic acid (1 + 3) and 5 ml of 20% Sn (10); Fe, Te (5); Zn (0.25); Tl