期刊论文

中文

中国卫生检验杂志

1004-8685

2007

17

8

1366-1367+1402

10.3969/j.issn.1004-8685.2007.08.009

本校为第一机构

目的：建立Cd^2＋ -I- -CV三元缔合物共振瑞利散射法测定痕量镉的新方法.方法：在硫酸介质中,Tween-20和AG存在下,Cd^2＋与Ⅰ-形成配阴离子[CdI4]^2-,进一步与结晶紫（CV）结合形成离子缔合物,溶液的RRS强度显著增强并产生相应的散射光谱.结果：在优化的实验条件下,RRS强度改变值与Cd^2＋浓度在6.97×10-4 ～4.30×10^-2 μg/ml范围内呈良好的线性关系（r=0.9992）,方法检出限0.210 ng/ml.结合巯基棉分离技术,分析水样中Cd^2＋,RSD小于3.00%,样品加标回收率95.50%～102.60%.结论：该方法检出限和灵敏度能满足环境水样中痕量镉的测定.

Objective：To propose a method for determination of trace cadmium in water samples. Methods：The ternary complex that was formed utilizing crystal violet （CV） associating with CdI42- formed by Cd^2＋ with I^- in dilute sulfuric acid medium and in the presence of Tween - 20 and AG enhanced significantly the RRS intensity. Results： Under the optimal conditions of the reaction system, the enhanced intensity of RRS was linear to the concentration of Cd^2＋ in the range of 6. 97× 10^-4 - 4. 30×10^-2 μg/nd with correlation coefficient 0. 9992 a...