NEW CATALYTIC METHOD FOR THE DETERMINATION OF VANADIUM

被引：10

作者：

DICKSON, EL

SVEHLA, G

机构：

[1] Department of Analytical Chemistry, The Queen's University, Belfast, Northern Ireland

来源：

MICROCHEMICAL JOURNAL | 1979年 / 24卷 / 04期

关键词：

D O I：

10.1016/0026-265X(79)90099-7

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new catalytic method for the determination of 0-0.6 ppm of vanadium is described. The method is based on the catalytic action of vanadium on the reaction of bromate with bromide at pH = 1.80 ± 0.05. In this hitherto unreported reaction no bromine is formed, but in a two-step process hypobromite is produced. The rate is monitored by potentiometry, and results are evaluated from the recorded potential vs time curves. The optimal conditions for the determination have been investigated, and interferences as well as their elimination studied. The stoichiometry, mechanism, and kinetics of both the uncatalyzed and the catalyzed reactions were investigated, and the rate constants (for 20 °C) and the entropies and enthalpies of activation of both the uncatalyzed and the catalyzed reactions were determined. © 1979.

引用

页码：509 / 521

页数：13

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[3]

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[4]

OSTWALD W, 1888, Z PHYS CHEM, V2, P127