酸性铬蓝K固体石蜡碳糊修饰电极溶出伏安法测定痕量铅  

Determination of Trace Lead by Anodic Stripping Voltammetry Using Acid Chrome Blue K Modified Solid Paraffin Wax Carbon Paste Electrode

作　　者：张海丽[1] 叶永康[1] 徐斌[1] 

机构地区：[1]湖北师范学院化学系,黄石435002

出　　处：《分析化学》2000年第2期194-196,共3页Chinese Journal of Analytical Chemistry

摘　　要：在pH为8．5，0．2mol/L氨性缓冲底液中，以酸性铬蓝K（ACBK）为修饰剂，固体石蜡为粘合剂，制备了ACBK修饰碳糊电极。Pb2+以Pb-ACBK络合物的形式吸附在电极上，在-1．0V电位下电解，以阳极溶出伏安法测定Ph2+，在0．11V（vs.SCE）处有灵敏的氧化峰，其一次微分峰电流与Pb2+浓度在1．0×10-11～1．0×10-5mol/L范围内的对数呈良好的线性关系。此法的检测限为5．0×10-12mol/L。The solid Paraffin wax carben paste electrode was medified by the acid chrome blue K (ACBK). In 0. 2 mol/L NH3·HO2-NH4Cl solution (pH = 8. 5), lead ion was acctimulated to form PbACBK complex on the chemically modified electrode at the applied potential of - 1.0 V. A sensitive oxidation peak of Pb2+ was observed with anodic tripping voltammetry. The peak potential is 0.11 V (vs. SCE). The 1st differential current-logarithm of concentration relationship is linear from 1.0×10-11 to 1 .0 ×10-5 mol/L. The detection limit is 5 .0×10-12 mol/L.

关 键 词：碳糊电 酸性铬蓝 溶出伏安 铅 皮蛋样品 

分 类 号：O657.1[理学—分析化学]