| 呋喃甲酰基吡唑啉酮铅三元配合物吸附波的研究 |
| A Study on Adsorptive Wave of Triple Complex of Furoylpyrazalone with Lead |
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| 摘要: 在pH值为3.75的HAc-NaAc介质中, 测得1-苯基-3-甲基-4-(α-呋喃甲酰基)吡唑啉酮-5(HPMαFP)与邻菲啰啉(phen)合铅三元配合物的灵敏极谱波(-0.51 V (vs SCE))。铅浓度在0.02～10 μg·mL-1范围内与峰电流分段呈良好的线性关系,检测下限为0.002 μg·mL-1。采用多种电化学方法研究了极谱波的性质和电极反应机理，证明-0.51 V处的极谱波为多元配合物吸附波，峰电流由中心离子Pb(Ⅱ)还原产生。根据直线法测得多元配合物组成为nPb2+∶nphen∶nHPMαFP=1∶1∶1，表观稳定常数为5.44×108。此体系用于粗盐、蔗糖和化妆品中铅测定，标准回收率98.5%～102.5%。 |
| 关键词: 呋喃甲酰基吡唑啉酮 邻菲啰啉 铅 配合物吸附波 |
| 基金项目: |
| Abstract: In the medium of HAc-NaAc (pH 3.75), A triple complex is formed though the Pb(Ⅱ) reacting with 1-phenyl-3-methyl-4-(α-furoyl)pyrazolone-5 (HPMαFP) and phenanthroline (phen), and there appears a sensitive polarographic wave at -0.51 V (vs SCE). The peak height has linear relation with the concentration of Pb(Ⅱ) from 0.02 μg·mL-1 to 10 μg·mL-1 respectively, their linear ranges are 0.02～0.05, 0.05～1.0 and 1.0～10 μg·mL-1. The detection limit is 0.002 μg·mL-1. By using many electrochemical methods, the properties of the polargraphic wave and the mechanism of electrode reaction are studied. The results indicate that the polargraphic wave at -0.51 V is an adsorptive wave of the complex. The peak current is produced by reduction of the Pb(Ⅱ) ion. The molar ration of Pb(Ⅱ) with phen and HPMαFP in the complex is 1∶1∶1; and the conditional formation constant of the complex is 5.44 × 108. The method was used to determine lead in thick salt, cane sugar and comestic samples. The recovery is 98.5%～102.5%. |
| Keywords: furoylpyrazalone phenanthroline lead adsorptive wave of complex |
| 投稿时间：2005-03-13 修订日期：2005-07-20 |
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| 徐丽英,李锦州,郑晓丹,杨玉玲.呋喃甲酰基吡唑啉酮铅三元配合物吸附波的研究[J].无机化学学报,2005,21(11):1614-1618. |
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