催化极谱法测定精锡中的微量镉  

Determination of Trace Cadmium in Fine Tin with Catalytc Polarography

作　　者：赵缨[1] 

机构地区：[1]昆明冶金研究院

出　　处：《云南冶金》1998年第S1期60-63,共4页Yunnan Metallurgy

摘　　要：介绍了在盐酸—四乙基溴化铵介质中，当碘化钾存在时与镉形成[CdI4]2-络离子，从而产生吸附催化波，使镉的催化电流增强。精锡中的锡、锑、砷用盐酸一氢溴酸挥发排除，其余元素用磷酸钠、抗坏血酸掩蔽消除其干扰。试验表明，本法适用于精锡中镉量0．0000X％~0．00X％的测定。A new method for determination of trace cadmium in fine tin is presented. In hydrochloric acid/tetera cthyl ammonium bromide medium, the presence of potassium iodide creates an catalgtic adsorption wave which comes form the formation of [CdI4]2- complex ion.The wave increases catalytic current of Cd. The removal of Sn, Sb and As in fine tin can be implemental by vaporization with addition of HCl/HBr acid, and other trace elements can be sheltered by using using sodium and ascorbic acid to eliminated their interference. Expecriments verified that this method fits determination of trace cadmium ranging from 10 to 0.1ppm in fine tin.

关 键 词：催化极谱法 镉 精锡 

分 类 号：O614.242[理学—无机化学]