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络合吸附波测定痕量钼的研究

Determination of Molybdenum by Adsorptivecomplex Polarographic Wave

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【作者】 周长利高天广李秀玲卢燕刘洪军

【Author】 Zhou Changli, Gao Tanguang, Li Xiuling, Lu Yan, Liu Hongjun(Department of Applied Chemistry, Shandong Institute of Building Materials Industry, Jinan,250022)

【机构】 山东建材学院应化系

【摘要】 在pH4.50的0.05mol/LHAc-NaAc介质中,研究了钼(Ⅵ)-邻菲络啉的极谱行为。钼(Ⅵ)-邻菲络啉(phen)配合物在2.5次微分极谱仪上于-0.50V,-0.67V处产生两个吸附还原波,后者的峰峰值e″pp与钼(Ⅵ)浓度在2.0×10-8~8.0×10-6mol/L范围内呈线性关系,检出下限可达5.0×10-10mol/L。研究了配合物组成,极谱波的性质及其机理。应用该法测定豆类食品中的微量钼,选择性好,灵敏度高。

【Abstract】 The polarographic behavior of Mo()phen system at a drop mercury electrode was investigated in a buffer solution of 0.05mol/L HAcNaAc (pH4.5). The Mo()phen complex produces two reduction peaks at -0.50V,-0.67V(vs.SCE).The peaktopeak epp(Ep=-0.67V) increases linearly with Mo() concentration. Under the optimum conditions, the limit of detection and the linear range of 2.5thorder derivative osillopolargraphic current epp were 5.010-10 mol/L and 2.010-88.010-6 mol/L Mo(),respectively. This method has been applied to the determination of trace Mo() in beans with satisfactory results. Also, the composition of Mo()phen complex and the mechanism of the electrode process have been studied.

【关键词】 络合吸附波邻菲络啉
【Key words】 Complex adsorption wave110phenanthrolineMolybdenum
  • 【文献出处】 分析科学学报 ,JOURNAL OF ANALYTICAL SCIENCE , 编辑部邮箱 ,1999年02期
  • 【分类号】O657.73
  • 【被引频次】3
  • 【下载频次】26
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