超高灵敏显色反应及其应用的研究Ⅷ.铅-乙基罗丹明B-碘化物体系  

Studies on Superhighly Sensitive Color Reactions and Their Applications Ⅷ. Lead-Ethylrhodamine B-Iodide System

作　　者：程刚[1] 许生杰 

机构地区：[1]中国科学院长春应用化学研究所

出　　处：《分析化学》1992年第4期403-406,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金

摘　　要：本文研究了在聚乙稀醇-阿拉伯胶共存下,乙基罗丹明B和PbI_4^(2-)的超高灵敏显色反应并制定了新的光度法。缔合物最大吸收为605nm,ε值为1.0×10~6·L·mol^(-1)·cm^(-1)。经巯基棉分离、富集,本法成功地用于硫酸镁、硫酸锌和硫酸亚铁铵等试剂中痕量铅的测定。A highly sensitive spectrophotometric method has been developed for the determination of trace lead, based on the formation of a complicated ion-association complex of lead (Ⅰ) with ethyirhodamine B and iodide in the presence of polyvinyl alcohol and Arabic gum. The maximum absorption of the ion-association complex is at 605nm, and its apparent molar absorptivity is 1.0×10~6 L.mol^(-1).cm^(-1).Beer's law is obeyed in the range of 0.1～3.0μg/25ml for lead. The interference of 20 diverse ions was studied. The proposed method has been used for the determination of trace lead in chemical reagents with satisfactory results.

关 键 词：乙基罗丹明B 铅 分光光度法 

分 类 号：O614.433[理学—无机化学]