碘化钾-镉(Ⅱ)-吖啶黄高灵敏离子缔合分光光度法测定痕量镉  

High Sensitive Spectrophotometric Determination of Trace Cadmium with Potassium Iodide-Cadmium(Ⅱ)-Acridine Yellow Ion Association System

作　　者：曾云[1] 姚康康[1] 王影[1] 杨嫘嫘[1] 覃事栋[1] 

机构地区：[1]吉首大学化学化工学院

出　　处：《光谱实验室》2012年第1期427-430,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：吉首大学布校级科研项目资助(11JDY050)

摘　　要：以聚乙烯醇为表面活性剂,在pH3.6乙酸-乙酸钠缓冲介质中,吖啶黄与[CdI_4]^(2-)络阴离子形成稳定的离子缔合物[AY]_2[CdI_4]。该缔合物的最大吸收波长为294nm,表观摩尔吸光系数为3.0×10~5L·mol^(-1)·cm^(-1),Cd(Ⅱ)质量浓度在0-25,ug·L^(-1)范围内符合比耳定律。该法直接用于铜镉渣中镉的测定,选择性好、灵敏度高,相对标准偏差为4.5%,测定结果令人满意。In the pH 3.6 HAc-NaAc buffer solution,a stable ion-association complex [AY]_2[CdI_4]of acridine yellow and[CdI_4]^（2-） was formed with Polyvinyl Alcohol as surfactant.This ion-association complex has its maximum absorption wavelength at 294nm and its apparent molar absorption coefficient reaches 3.0×10~5L · mol^（-1） · cm^（-1）,the Beer law is obeyed in the range of 0—25μg · L^（-1） cadmium.This high selective and sensitive method was applied directly to determination of cadmium for copper-cadmium slag,the relative standard deviation is 4.5%,and the result is satisfied.

关 键 词：镉 吖啶黄 离子缔合物 分光光度法 

分 类 号：O657.32[理学—分析化学]