锡(Ⅳ)邻苯三酚红硒(Ⅳ)体系极谱吸附催化波的研究  

STUDIES ON THE POLAROGRAPHIC ADSORPTIVE CATALYTIC WAVEOF TIN(Ⅳ)PYROGALLOL REDSELENIUM(Ⅳ) SYSTEM

作　　者：龙晖[1] 李益恒[1] 

机构地区：[1]湘潭大学化学化工学院

出　　处：《湘潭大学自然科学学报》1998年第2期62-65,共4页Natural Science Journal of Xiangtan University

摘　　要：在含有０．０３ｍｏｌ／ＬＫＣｌ、４．０×１０－５ｍｏｌ／ＬＳｅ（Ⅳ）的０．０１６ｍｏｌ／ＬＨ２ＳＯ４溶液（ｐＨ１．８）中，锡（Ⅳ）邻苯三酚红配合物产生一灵敏的二次导数极谱波，峰电位为－０．４３Ｖ（ｖｓ·ＳＣＥ），波高与锡浓度在１．７×１０－９～６．７×１０－７ｍｏｌ／Ｌ范围内呈线性关系，检测限可达８×１０－１０ｍｏｌ／Ｌ．研究了极谱波的性质和电极反应机理．方法已成功地应用于奶茶中微量锡的测定，结果满意．In a 0.016 mol/L sulfuric acid solution(pH1.8)containing 0.03 mol/L potassium chloride and 4.0×10-5 mol/L Selenium(Ⅳ),a sensitive polarographic adsorptive catalytic wave of tin(Ⅳ)pyrogallol red complex was obtained with a peak potential at -0.43 V (vs·SCE).The peak height is linearly proportional to the concentration of tin(Ⅳ) over the range from 1.7×10-9 mol/L to 6.7×10-7 mol/L,the detection limit for tin is as low as 8.0×10-10 mol/L.In this paper the properties of the polarographic wave and the electrode reaction mechanism were discussed too. The proposed method has been applied to the determination of trace tin(Ⅳ) in milk tea with satisfactory results.

关 键 词：锡 邻苯三酚红 单扫描极谱 配合物 极谱波 

分 类 号：O614.432[理学—无机化学] O657.14[理学—化学]