新螯合滴定剂的研究与应用——三乙四胺六乙酸直接络合滴定锌  

STUDY AND APPLICATION OF NEW CHELATING TITRANT——DIRECT CHELATOMETRIC TITRATION OF Zn WITH TRIETHYLENETETRAAMINEHEXAACETIC ACID(TTHA)

作　　者：刘锦昌[1] 肖本毅[1] 

机构地区：[1]广州有色金属研究院

出　　处：《广东有色金属学报》1992年第1期78-82,共5页Journal of Guangdong Non-Ferrous Metals

摘　　要：研究了以5-Br-PADAP 为金属指示剂,用三乙四胺六乙酸为螯合剂,直接络合滴定锌的新方法.指出在 pH 6.0—6.4的六次甲基四胺缓冲介质中滴定锌,指示剂在终点时的颜色变化由玫瑰红色突变为黄色,十分敏锐、清晰.方法的准确度、重现度和选择性皆好.作为一种新滴定法,可推荐作铅精矿、锌精矿、铅锌矿及锌基合金等各种含锌试料中锌的测定.相对标准偏差为0.32%(n=10).测定范围为1.0—99%Zn.该法可与 EDTA 滴定法相媲美.A new method for direct chelatometric titration of Zn is studied. This method is based on the chelation of Zn with TTHA as titrant in aqeous medium and the end point is detected with 5-Br-PADAP-OP as metal indicator.It is shown that when the titration of Zn is in hexamethylene-tetramine buffer at pH 6.0—6.4, the indicator is very sensitive and a very sharp end point can be obtained.The relative standard deviation is 0.32%(n=10).The method has been successfully used to deter- mine Zn in lead-zinc ores,lead-zinc concentrates,zinc-base alloys and different kinds of samples containing Zn.

关 键 词：络合滴定 锌 TTHA 

分 类 号：TF801.3[冶金工程—有色金属冶金]