痕量银的催化动力学测定法研究

高等学校化学学报 ›› 1987, Vol. 8 ›› Issue (5): 407.

痕量银的催化动力学测定法研究

张振辉, 周伟, 闻一宁

江西大学化学系

收稿日期:1986-01-18 出版日期:1987-05-24 发布日期:1987-05-24

The Study of the Determination of Trace Silver by Catalytic Kinetics

Zhang Zhenhui, Zhou Wei, Wen Yining

Department of Chemistry, Jiangxi University, Nanchang

Received:1986-01-18 Online:1987-05-24 Published:1987-05-24

摘要/Abstract

摘要： 研究了在稀硫酸溶液中,在Ag⁺的存在下,K₄Fe(CN)₆和o-Phen的反应(银的新指示反应),反应机理为并用此来测定痕量银。根据Arrhenius方程式计算了催化和非催化反应的活化能,分别为64.15KJ/mol和96.89KJ/mol。本方法灵敏度为8×10^-12g·ml^-1,且选择性好。测定地质样品结果满意。平均标准偏差为0.024,变动系数2.43%。

Abstract: Anew indicator reaction catalyzed by silver has been studied. When silver is present K₄Fe(CN)₈reacts with o-phenanthroline in the solution of dilute H₂SO₄, the mechanism may be represented as follow:Fe(CN)₆^4-+3(o-Phen)^AgFe(o-Phen)₂(ornge)+6CN^-and trace silver could be estimated with the reaction.The apparent activation energies of catalytic and uncatalytic reaction are 64.15 and 96.89 kJ·mol^-1, respectively, was calculated by Arrhenius Formula.Compared with other methods, this one is higher sensilivity and selectivity. The sensitivity is 8×10^-12g·ml^-1.The method has been used for the determination of silver in geological samples with satisfactory results .The average standard deviation of determination is 0.024 and the average coefficient variation 2.43%.

TrendMD:

张振辉, 周伟, 闻一宁. 痕量银的催化动力学测定法研究. 高等学校化学学报, 1987, 8(5): 407.

Zhang Zhenhui, Zhou Wei, Wen Yining. The Study of the Determination of Trace Silver by Catalytic Kinetics. Chem. J. Chinese Universities, 1987, 8(5): 407.