Mo（Ⅵ）－N－苯甲酰苯基羟胺络合物的极谱催化波  

Polarographic Catalysis Wave of Molybdenum Benzoylphenylhydroxyamine Complex

作　　者：孟凡昌[1] 杜卫红[1] 邵兵[1] 张玉清[1] 

机构地区：[1]武汉大学化学系

出　　处：《分析科学学报》1995年第3期66-68,共3页Journal of Analytical Science

摘　　要：本文研究了Ｍｏ（Ⅵ）与Ｎ－苯甲酰苯基羟胺（ＢＰＨＡ）络合物的极谱行为，讨论了六次甲基四胺（ＨＭＡ）在形成极谱电流时的作用。在ＨＡＣ－ＮａＡｃ介质中，Ｍｏ（Ⅵ）－ＢＰＨＡ络合物在单扫示波极谱上，于－０．４５Ｖ产生一灵敏的吸附催化波。当体系中引入ＨＭＡ时，该波大幅度地向负电位方向移动至－１．１４Ｖ，灵敏度约提高２倍，且使空白基线平滑，有利于波的测量。该波检测限达４×１０－９ｍｏｌ／Ｌ，线性范围０～４×１０－７ｍｏｌ／Ｌ，工作曲线通过原点。测定了天然水中的痕量钼，讨论了极谱电流的机理。in acetic buffer solution eontaining hexamethlenamine(HMA) and benzoylphenylhydroxyamine (BPHA ), a polarographic catclytic Peak at -1.14 V(vs.SCs.)related to Mo(Ⅳ)species appears using Linear Sweep Polarography (LSP).On cathodic sweep,the magnitude of the derivative 'Mo(Ⅳ) Peak' has a linear dependence on Mo(Ⅳ) concentration over the range of 0～4×107mol/L.The detection limit has been 4×10 -9mol/L (0.4μg/L). Optimum conditiions for the detemination has been established as 0. 1mol/L acetic beffer (pH 4.0-4.2),3 ×10-4mol/L BPHA, 0. 02mol/L HMA and 0.03mol/L KNO3.'Mo (Ⅳ) Peak' is stable for at least 3h.More than thirty common ions have been examined for their possible interference in the determination of 1.4×107mol/L Mo(Ⅳ).For practical application, molybdenum contents in running water have been analysed by the presented procedure with satisfactory results.

关 键 词：钼 极主普 苯甲酰苯基羟胺 天然水 极谱电流 

分 类 号：O614.612[理学—无机化学] O657.14[理学—化学]