高等学校化学学报

高等学校化学学报 ›› 1982, Vol. 3 ›› Issue (4): 452.

• 论文 • 上一篇    下一篇

Gran滴定增量法——微量氯的测定

仰蜀薫, 孙炳耀   

  1. 郑州大学化学系
  • 收稿日期:1981-05-11 出版日期:1982-12-24 发布日期:1982-12-24

GRAN TITRATION WITH INCREMENT METHOD——DETERMINATION OF TRACE CHLORIDE

Yang Shuxun, Sun Bingyao   

  1. Department of Chmistry, Zhengzhou University, Zhengzhou
  • Received:1981-05-11 Online:1982-12-24 Published:1982-12-24

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摘要： 本文讨论了沉淀溶解度对Gran滴定的影响。由修正的Gran函数字出误差方程:Ra=-Cs(V0+V)/C,据此方程可以进行误差分析和计算。在测Cl-时,若滴定剂(AgNO3)浓度为2×10-3M,测定的适宜范围为5×10-6M—5×10-5M。增量法的引入使5×10-6M以下Cl-的测定成为可能,测定下限浓度达1×10-6M,变动系数为20%。

Abstract: This paper discusses the influence of the precipitate solubility on Gran titration. An equation of the error has been derived from the modified Gran function. The theoretical errors have been calculated for determining chloride of various concentrations. If the titrant (AgNO3) concentration is 2× 10-3 M, the determination is suitable in the range of 5×10-6 M—5 ×105-M.In order to improve the sensitivity and accuracy,increment method is suggested for determining the chloride below 5×10-6M. The limit concentration of chloride for determining is 1×10-6 M and the coefficient of variation is 20%.

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