IO_4^-离子选择电极催化动力学测定铜  

KINETIC DETERMINATION OF COPPER(Ⅱ)USING IO ION SELECTIVE ELECTRODE

作　　者：马万红[1] 冶保献[1] 石云飞[1] 仰蜀薰[1] 

机构地区：[1]郑州大学化学系

出　　处：《郑州大学学报（理学版）》1994年第2期62-65,74,共5页Journal of Zhengzhou University:Natural Science Edition

摘　　要：弱酸性介质中ＩＯ氧化Ｓ_２Ｏ反应可被痕量Ｃｕ（Ⅱ）催化加速，据此，本文研究了以ＩＯ离子选择性电极跟踪反应过程中ＩＯ浓度变化催化动力学测定痕量Ｃｕ（Ⅱ）的方法．测定Ｃｕ（Ⅱ）的线性范围０．０８ｎｇ─０．４ｎｇ／２５ｍｌ，检出限为１．５×１０￣（－３）ｎｇ／ｍｌ．基于ＥＤＴＡ和ＥＧＴＡ能与Ｃｕ（Ⅱ）形成稳定配合物使Ｃｕ（Ⅱ）催化能力降低的原理，本文利用该催化体系，即在痕量铜（Ⅱ）存在下，实现了动力学法测定微量ＥＤＴＡ和ＥＧＴＡ．This paper describes a new kinetic methed for determination of trace amount of Cu(Ⅱ). It bases on the catalytic effect of Cu(Ⅱ)to the reaction between periodate and thiOsulfatewith IO ion selective electrode as an indictor electrode. Taking a fked-time procedure,the △E(re-action velocity) is proportional to the concentration of Cu(Ⅱ)in the range of 0. 08─6. 4ng/25ml。The proposed catalytic system is also used for the determination of EGTA and EDTA, on the basisof their inhibitory effect on the catalytic ability of cupper.

关 键 词：动力学分析 催化法 离子选择性电极 铜(Ⅱ) 

分 类 号：O643.3[理学—物理化学]