络合滴定法连续测定锡青铜中锌锡铅  

Continuous Determination of Zinc, Tin and Lead in Tin Bronze with Complexometric Titration

作　　者：卢艳蓉[1] 王逸飞 石琳[1] 周春玲[1] Lu Yan-rong;Wang Yi-fei;Shi Lin;Zhou Chun-ling(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Zhejiang University of Science and Technology,Hangzhou 310013,Zhejiang,China)

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010 [2]浙江科技学院,浙江杭州310013

出　　处：《包钢科技》2022年第3期90-94,共5页Science & Technology of Baotou Steel

摘　　要：利用氨水与锌、铜形成络合离子,与铅、锡生成沉淀的特性将锌、铜与铅、锡分离。实验了EDTA滴定锌、铅、锡的酸度、硫脲及氟化铵的加入量及缓冲溶液等对测定的影响,实验结果表明,EDTA滴定锌时,溶液酸度pH值为4.5~5.0时,滴定的选择性较高;测定铅、锡时,溶液酸度pH值为5.0~6.0时,滴定终点颜色变化敏锐,加入磺基水杨酸可以规避共存离子的干扰。本方法的测定范围为0.50%~20%,对锡青铜样品中锌、铅、锡进行分析,其相对标准偏差均小于2.0%,加标回收率在97%~103%之间。The zinc and copper are separated from lead and tin based on the characteristics that ammonium hydroxide, zinc and copper form complex ions as well as ammonium hydroxide, lead and tin form precipitates. The effects of the acidity of zinc, lead and tin titrated with ethylene diamine tetraacetic acid(EDTA), added quantity of thiourea and ammonium fluoride as well as buffer solution on determination are tested. The test results showed that the pH value of solution acidity was 4.5~5.0 and selectivity of titration was higher when zinc was titrated with EDTA;pH value of solution acidity was 5.0~6.0 when determined lead and tin as well as the colors at titration end point changed sharply. The interference of coexisting ions could be avoided by adding sulfosalicylic acid. The determination range of this method is 0.50%~20%, relative standard deviations of zinc, lead and tin in tin bronze samples are all smaller than 2.0% through analysis as well as adding standard recovery is 97%~103%.

关 键 词：锡青铜 锌 锡 铅 

分 类 号：TQ421.35[化学工程]