几种含硫有机化合物与铜的络合物的极谱行为研究

STUDIES ON THE POLAROGRAPHIC BEHAVIOUR OF SOME SULPHUR-CONTAINING ORGANIC COMPOUNDS IN THE PRESENCE OF COPPER IONS

高胱氨酸、６－巯基嘌呤和硫尿嘧啶均能与铜离子作用而在汞电极上产生两个吸附波．在柠檬酸钠溶液中，高胱氨酸与铜的络合物在－０．０６ｖ（ｖｓ．ＳＣＥ）处产生的阳极化波较为灵敏，其检测限为２×１０－８ｍｏｌ／Ｌ高胱氨酸，线性范围为８×１０－８～１×１０－５ｍｏｌ／Ｌ．６－巯基嘌呤和硫尿嘧啶在乙二胺介质中与铜产生的络合物波较好，前者在－０．８３Ｖ处和后者在－０．４４Ｖ处的阴极波较适合于分析．它们的检测限分别为８×１０－８ｍｏｌ／Ｌ和５×１０－８ｍｏｌ／Ｌ，线性范围为１×１０－７～１×１０－５和１×１０－７～２×１０－５ｍｏｌ／Ｌ．对这三种化合物与铜离子的络合物波的性质和机理进行了初步研究．

Sensitive polarographic waves which relate to thiouracil, 6-mercaptopurine(in ethylenediamino medium) and homocystine(in sodium citric acid buffer solution) appeared in the presence of Cu(Ⅱ). The waves are very useful for the determination Of these compounds, for homocystine, 6-mercaptopurine and thiouracil, the detection limits are 2×10-8, 8×10-8 and 5×10-8 mol/L,respecrespectively. In this paper, the polarographic properties of these waves have been discussed.