铜（铅）－Ferron－氯化四苯胂络合物吸附波研究

Studies on the Adsorptive ComplexWave of Copper-,Lead-7-Iodo-8-Hydrox-yquinoline-5-Sulfonic Acid(Ferron )-Te-traphenylarsonlum Chloride(TPAC)

在ＨＣｌ￣（－）六次甲基四胺介质（ｐＨ４．６２）中，铜（铅）－Ｆｅｒｒｏｎ氯化四苯胂络合物产生灵敏的络合吸附波。峰电位分别为－１．４１Ｖ和－０．５７Ｖ（Ｕｓ．ＳＣＥ）。峰电流与铜、铅浓度分别在０．０００４～０．４μｇ／ｍＬ和０．００２～０．８μｇ／ｍＬ之间呈线性关系，检出限分别为０．０００２μｇ／ｍＬＣｕ和０．００１μｇ／ｍＬＰｂ。研究了极谱波的性质和电极反应机理。用拟定的方法连续测定水样和食品中的铜、铅，结果满意。

Sensitive polarographic adsorptive com-plex waves of Cu(Ⅱ)-and Pb(Ⅱ)-7-iodo-8-hydroxyquinoline-5-sulfonic acid(ferron)-te-traphenylarsonium chloride ( TPAC)wereobtained respectively by using single sweeppolarography in 0. 02mol/L HCl-0.05mol/Lhexamethylene tetramine at pH4.6. Thepeak potentias appeared at-0. 41V and-0.5 7V (vs. SCE) respectively. The peak cur-rent was linearly related to the concentrationof copper and lead in the range from 0.0004～0. 4μg Cu/ml and 0. 002～0. 8μg Pb/mLrespectively.The detection limit is0.0002μg/mL and 0.001μg/mL for copperand lead respectively.The proposed methodhas been applied to the continuous determi-nation of trace copper and lead in waters andfoods with satisfactory results.The mecha-nism of the electrode reaction has been di-cussed.