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化学学报
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化学学报 ›› 1980, Vol. 38 ›› Issue (4): 387-391. 上一篇    下一篇

研究简报

库仑络合滴定 Ⅱ.微量锆的库仑络合滴定

莫金垣, 林植青   

  1. 中山大学化学系 广州
  • 投稿日期:1978-06-23 发布日期:2013-06-03

COULOMETRIC-COMPLEXOMETRIC TITRATION Ⅱ. COULOMETRIC-COMPLEXOMETRIC TITRATION OF MICRO AMOUNTS OF ZIRCONIUM

MO JIN-YUAN, LIN ZHI-QING   

  1. Chemistry Department, Sun Yat-sen University, Guangzhou
  • Received:1978-06-23 Published:2013-06-03

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有关微量锆的络合滴定已有研究[1,2],而微量锆的库仑络合滴定尚未见有文献报道。锆与EDTA有较强的络合能力,能在酸性溶液中将Fe3+-EDTA络合物中的Fe3+置换出来。而Fe3+能被电生的Fe2+-EDTA滴定[3]。为此,本文以Fe3+-EDTA电生Fe2+-EDTA为滴定剂,5-磺基水杨酸为指示剂,用分光光度法确定终点,建立微量锆的库仑络合滴定方法。

A method has been established for coulometric-complexometric titration of microgram quantities of zirconium with high selectivity.At pH 1.5-1.8 zirconium can displace the ferric ion from the Fe3+-EDTA complex.Then the released ferric ion was titrated with the electrogenerated Fe2+-EDTA from Fe3+-EDTA and a current density 135μA/cm2.The end point was detected spectrophotometrically with sulfosalicylic acid as indicator.Many metal ions, excopt bismuth (Ⅲ),did not interfere.The relative error is 0.1-0.5% for 3.6-45μg of zirconium.