钴-乙二胺-亚硝酸盐体系的极谱催化波研究

高等学校化学学报 ›› 1983, Vol. 4 ›› Issue (4): 439.

钴-乙二胺-亚硝酸盐体系的极谱催化波研究

李南强, 王文喜, 赵凯元

北京大学化学系

收稿日期:1982-02-16 出版日期:1983-08-24 发布日期:1983-08-24

STUDY ON THE POLAROGRAPHIC CATALYTIC WAVE OF COBALT IN ETHYLENE DIAMINE-NITRITE SOLUTION

Li Nanqiang, Wang wenxi, Zhao Kaiyuan

Department of Chemistry, Peking University, Beijing

Received:1982-02-16 Online:1983-08-24 Published:1983-08-24

摘要/Abstract

摘要： 本文报道了钴在乙二胺、亚硝酸钠溶液中极谱催化波产生的条件及其在镍盐中杂质钴测定的应用。同时也报道了对这种波形成机理的研究。

Abstract: In a supporting electrolyte containing 0.04-0.lM ethylene diamine, 0.4-l.0M NaNO₂ and at pH11, we obtained a sensitive polarographic catalytic wave of cobalt. The catalytic wave is in a peak shape withpeak potential between -1.2-1.3V (SCE). The limits of detection ofdc and single-sweep polarography for cobalt are 5×10^-9M and 5×10^-10M respectively.The method has been applied to the determination of cobalt in nickel salts.It is confirmed that in the compact layer of electrical double layer the associated ion pair [(Co(en)³)²⁺·NO₂^-]+ results in the formation of catalytic wave. The overall electrode reaction may be represented as follows: where E₁＞E₂

TrendMD:

李南强, 王文喜, 赵凯元. 钴-乙二胺-亚硝酸盐体系的极谱催化波研究. 高等学校化学学报, 1983, 4(4): 439.

Li Nanqiang, Wang wenxi, Zhao Kaiyuan . STUDY ON THE POLAROGRAPHIC CATALYTIC WAVE OF COBALT IN ETHYLENE DIAMINE-NITRITE SOLUTION. Chem. J. Chinese Universities, 1983, 4(4): 439.