络合吸附极谱波测定痕量钼
Polarographic Determination of Traces of Molybclenum(Ⅵ) by the Adsorptive Wave of the Complex of Mo(Ⅵ) with Alizarin
摘 要
在0.05 mol·L-1 HOAc-NaOAc(pH 4.74)介质中,Mo(Ⅵ)-茜素络合物在二阶导数极谱图上产生良好的吸附还原波,从而建立了络合吸附极谱法测定痕量钼的方法,其峰电位约为-0.32 V(vs.SCE).其峰电流(I″p)与Mo(Ⅵ)浓度在8.9×10-8~2.4×10-6mol·L-1范围内呈线性关系,检出限为7.0×10-9mol·L-1.应用该法测定了茶叶、人发中痕量钼,测得回收率在98%~104%之间.研究了络合物的组成和极谱波的性质.
络合吸附波
钼
茜素
Polarography
Adsorptive wave of complex
Molybdenum
Alizarin
Abstract
In an acetate buffer medium of pH 4.74,a sensitive polargoraphic-adsorptive-reductive wave was observed produced by the complex of Mo(Ⅵ) with alizarin,with its peak potential at -0.32 V (vs.SCE).Linear relationship between the values of 2nd derivative of it peak current (I″p) and concentration of Mo(Ⅵ) was found in the range of 8.9×10-8~2.4×10-6mol·L-1,with a detection limit of 7.0×10-9mol·L-1.Based on these facts,a sensitive polarographic method for determination of traces of molybdenum was proposed.In its application to the analysis of samples of tea and human hair,values of recovery found were in the range of 98%-104%.The composition of the complex and the characteristics of its polarographic wave were also studied.
中图分类号 O657.14
所属栏目 试验与研究
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收稿日期 2006/10/19
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备注英荣建(1965-),山东临沭人,讲师,主要从事电分析化学的教学及科研工作.
引用该论文: YING Rong-jian. Polarographic Determination of Traces of Molybclenum(Ⅵ) by the Adsorptive Wave of the Complex of Mo(Ⅵ) with Alizarin[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2007, 43(6): 440～442
英荣建. 络合吸附极谱波测定痕量钼[J]. 理化检验－化学分册, 2007, 43(6): 440～442
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参考文献
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