铋膜电极吸附溶出伏安法测定铅的研究  

Determination of Trace Lead by Adsorption Stripping Voltammetry at Bismuth Film Electrode

作　　者：李伟新[1] 

机构地区：[1]国土资源部放射性与稀有稀散矿产综合利用重点实验室(广东省矿产应用研究所),广东韶关512026

出　　处：《广东化工》2015年第6期51-52,共2页Guangdong Chemical Industry

摘　　要：建立了采用铋膜电极应用吸附溶出伏安法测定痕量铅的方法。在含有Pb（II）的0.1 mol·L^-1柠檬酸-柠檬酸钠缓冲溶液（pH 6.7）中,于-0.1V搅拌富集,Pb（II）与茜素紫形成络合物而富集于电极表面,然后交换介质至空白底液中,于-0.85 V还原后再进行阳极化扫描,于-0.60 V左右获得一灵敏的铅氧化溶出峰,溶出峰电流与Pb（II）的浓度在1.2×10^-8～2.4×10^-6 mol·L^-1范围内呈良好的线性关系,检出限达6.2×10^-9 mol·L^-1。方法应用于皮蛋中铅的测定,其加标回收率达到98.0%～122.0%,结果较满意。The determination method of lead （Ⅱ） with bismuth-film electrode by adsorption stripping voltammetry was established. The lead （Ⅱ） was accumulated on the bismuth-film electrode surface at -0.1V by the formation of the complex in 0.1 mol/L sodium citrate-citric acid solution, and then determined by anodic stripping voltammetry after cathodic reduction at -0.85 V. The peak potential is at about -0.6 V. The concentration of Pb （Ⅱ） is directly proportional to the second-order derivative perk height over the range from 1.2×10^-8 to 2.4× 10^-6 mol/L and the detection limit for Pb（Ⅱ） is as low as 6.2×10^-9 mol/L. And the standard addition recovery was 98.0%- 122.0 %. The proposed method has been applied to the determination of lead （Ⅱ） in preserved egg with satisfactory results.

关 键 词：铅 吸附溶出伏安法 铋膜电极 茜素紫 

分 类 号：O657.1[理学—分析化学]