呋喃甲酰基吡唑啉酮Pb(Ⅱ)络合物吸附波的电化学性质  

Electrochemical Behavior of Study on the Polarographic Adsorptive Wave of the Complex formed by Lead(Ⅱ) and Furoylpyrazolone

作　　者：徐丽英[1] 李锦州[1] 郑晓丹[1] 杨玉玲[1] 

机构地区：[1]哈尔滨师范大学化学系,哈尔滨150080

出　　处：《理化检验（化学分册）》2007年第2期138-140,148,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：教育部重点科技项目;黑龙江省自然科学基金(B01-07);黑龙江省教育厅科研基金资助项目

摘　　要：在pH 4.0的HOAc-NaOAc介质中,Pb（Ⅱ）与1-苯基-3-甲基-4-（α-呋喃甲酰基）吡唑啉酮-5（HPMαFP）生成络合物,于-0.46 V（νs.SCE）处出现一灵敏的极谱峰,Pb（Ⅱ）的质量浓度在0.10～10.0 mg·L^-1范围内峰电流与浓度呈线性关系.用多种电化学方法研究了极谱波的性质及电极反应机理,证明-0.46 V处的极谱波为络合物吸附波,峰电流由中心离子Pb（Ⅱ）还原产生.用直线法测得络合物组成为Pb（Ⅱ）：HPMaFP=1：2,表观稳定常数为4.97×10^6.A complex was formed by the reaction between Pb（ Ⅱ ） and furoylpyrazolone rl-phenyl-3-methyl- 4-（α-furoyl）-pyrazolone-5, abbreviated as HPMαFP], in an acetate buffer medium of pH 4. 0. A sensitive polarographic wave was observed at -0.46 V （vs. SCE）. A linear relationship between the peak height （ip） and the concentration of Pb（ Ⅱ ） ion was obtained in the range of 0. 10 to 10. 0 mg per L-1 of solution. Based on the results of the electrochemical study, the polarographic wave at -0. 46 V was proved to be an adsorptive wave of the lead（ Ⅱ ）-HPMaFP complex, and the peak current was produced by the reduction of Pb（ Ⅱ ）-ion. The mole-ratio of the complex （Pb ： R） was studied and found to be 1 ： 2, and its apparent stability constant was found to be 4. 97×10^6.

关 键 词：极谱吸附波 铅(Ⅲ)络合物吸附波 铅 1-苯基-3-甲基-4-(α-呋喃甲酰基)吡唑啉酮-5 

分 类 号：O657.1[理学—分析化学]