镉－四（4－磺酸基苯基）卟啉络合物的极谱吸附波研究

Polarographic adsorption wave of Cd-meso-tetra(4-sulfonylphenyl)porphyrin complex

在ＫＯＨ底液中，Ｃｄ（Ⅱ）与四（４－磺酸基苯基）卟啉形成的络合物能吸附在滴汞电极上，峰电位Ｅ＿ｐ＝－１．２４Ｖ（相对于ＳＣＥ）。极谱波具有吸附性，极谱法测出了络合比、条件稳定常数及络合物还原时的电子转移数。检测限为１．８×１０￣（－８）ｍｏｌ／Ｌ许多阴、阳离子不干扰镉的测定．

The polarographic adsorption wave of Cd(Ⅱ)complex(Cd-TPPS_1)with meso-tetra(4-sul-fonylphenyl)porphyrin in KOH solution is studied. The peak potential of the wave is about-1.24 V(vs.SCE).The result shows that the ratio of Cd(Ⅱ):TPPS_1 in the complex is 1:1,the conditional sta-blity constant of complex(β′)is 4.5×10￣7.the number of electron transfer in reduction of complex is2 and the detection limit is 1.8×10￣(-6)mol/L。