光度络合滴定(Ⅲ)——微量钛(Ⅳ)的滴定(以二苯羟乙酸为隐蔽剂)  

Spectrophotometric-Gomplexometric Titrations(Ⅲ)--The Titration of Micro-Quantities of Titanium(Using Benzilic Acid as Masking Agent)

作　　者：陈永兆[1] 邱若兰 陈焕光[1] Chen Yougzhao;Qiu Ruolan;Chen Huanguang(Chemistry Department,Zhongshan University,Guangzhou)

机构地区：[1]中山大学化学系

出　　处：《高等学校化学学报》1985年第4期306-310,共5页Chemical Journal of Chinese Universities

摘　　要：以DCTA为滴定剂时二苯羟乙酸是钛(Ⅳ)的专属性隐蔽剂.利用DCTA-二苯羟乙酸隐蔽法并用光度终点,可选择滴定低至90ppb的钛.应用本法,不用分离可滴定石英石和石英砂中的微量钛.与丙二酸联合使用,可作钛和铝或钛、铝和铁的联合滴定.Benzilic acid was found to be a specific masking agent for Ti(Ⅳ)at pH 4.5-7.0.This paper reports that using the"DCTA-benzilic acid masking method",3-100μg of Ti(in 35ml)can be accurately spectrophotometrically titrated at pH 5.5 using standard zinc solution as the back titrant and xylenol orange as the indicator.The selectivity is very high.The following ions will not interfere.Th,Zr,Fe(Ⅲ),Al,Ga,In,Tl,Cr(Ⅲ),As(Ⅲ),U(Ⅵ),Mo(Ⅵ),Sc,Y,Yb,Nd,Cu,Pb,Ni,Co,Cd,Ag and the alkali earths.The TiO_(2) content in quartz as little,as 0.005%can be accuratel y determined with this method.

关 键 词：络合滴定 二苯羟乙酸 滴定剂 丙二酸 隐蔽剂 (Ⅲ) 石英石 钛(Ⅳ) 

分 类 号：O65[理学—分析化学]