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.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2000年第2期194-196,共3页
Chinese Journal of Analytical Chemistry
关键词
碳糊电
酸性铬蓝
溶出伏安
铅
皮蛋样品
Carbon paste electrode, acid chrome blue K, anodic stripping voltammtry, lead
