1-(4-甲酰氨基苯)-3-(4-偶氮苯基苯)-三氮烯键合硅胶混合碳糊电极溶出伏安法测定镉

Study of Anodic Stripping Voltammetry Determination of Cadmium Using Silica Gel Bonded by 1-(4-Methanamido Benzene)-3-(4-Azophenyl Benzene)-Triazene Modified Carbon Paste Electrode

以 1 -(4 -甲酰氨基苯 ) -3 -(4 -偶氮苯基苯 ) -三氮烯键合硅胶 (MBABT-SG)为修饰剂 ,液体石蜡为粘合剂 ,制备 MBABT-SG修饰碳糊电极 ,在 p H=8.0 0 ,0 .2 mol/L 的氨性缓冲底液中 ,于 -1 .2 0 V(vs.SCE,下同 )的电位下富集 ,将 Cd2 + 以 Cd-MBABT-SG络合物的形式吸附在电极上 ,以阳极溶出伏安法测定。于-0 .764V处有一灵敏氧化峰 ,峰电流与 Cd2 +的浓度在 5 .0× 1 0 -7～ 1 .0× 1 0 -4mol/L范围内成良好的线性关系 ,检出限为 1 .0× 1 0 -7mol/L。

In this paper,silica gel bonded by 1 (4 methanamido benzene) 3 (4 azophenyl benzene) triazene(MBABT SG) modified carbon paste electrode has been made.In 0 2mol/L NH 3·H 2O NH 4Cl buffer(pH=8 0),Cadmium ions was accumulated under -1 20V for 90s on the electrode.A sensitive oxidative peak of Cd was observed with anodic stripping voltammetry(ASV) method.The peak potential was 0 764V(vs.SCE).The current/concentration relationship was linear from 1×10 -4 ～5×10 -7 mol/L.The detect limit was 1×10 -7 mol/L.