谷胱甘肽自组装膜修饰电极用于Cr(VI)离子的测定  

Investigation of Cr(VI) on the golden electrode modified by glutathione

作　　者：杨培慧[1] 赵秋香[1] 朱洁晶[1] 蔡继业[1] 

机构地区：[1]暨南大学化学系,广东广州510632

出　　处：《暨南大学学报（自然科学与医学版）》2004年第1期97-101,共5页Journal of Jinan University(Natural Science & Medicine Edition)

摘　　要：　将谷胱甘肽(GSH)自组装膜修饰电极用于Cr(Ⅵ)的测定.实验表明,在0 02mol/LH2SO4+0 1mol/LNaNO3溶液中,在+1 00～-0 40V电位范围内进行循环伏安扫描,于+0 29V(Vs.SCE)处获得铬的还原峰信号、+0 65V(Vs,SCE)处获得铬的氧化峰信号.Cr(VI)在GSH/Au修饰电极上的电化学行为比裸金电极有明显的改善,峰电流更为灵敏,且还原峰电流随着Cr(VI)浓度的增加而增大,因此选择+0 29V的还原峰作为分析信号,运用1 5次微分线性扫描伏安法对铬进行了定量分析,线性范围为1 0×10-8～1 0×10-6mol/L,检测限为1 0×10-9mol/L.将所建立的方法应用于湖水样品中铬含量的测定,以ICP进行对照实验,结果满意.The golden electrode modified by L-glutathione is applied to determine Cr(VI) in 0.02 mol/L H_2SO_4+0.1 mol/L NaNO_3. The result showed that the modified electrode has better sensitivity for chromium than the bare golden electrode.The reductive peak current of Cr(VI) has good linearity with concentration in the range of 1.0×10^(-8)-1.0×10^(-6) moL/L, and the detection limit is 1.0×10^(-9) moL/L. The method was applied to determine Cr(VI) in the sample of lake water, and obtained a satisfactory result.

关 键 词：铬 谷胱甘肽 修饰电极 循环伏安法 

分 类 号：O657[理学—分析化学]