期刊论文

中文

华中师范大学学报(自然科学版)

1000-1190

2005

39

2

216-218,221

10.19603/j.cnki.1000-1190.2005.02.020

本校为第一机构

在5.0×10-3 mol/L的盐酸介质中,钼与8-羟基喹啉-5-磺酸生成的络合物在NaNO 2存在下,于-0.30 V(vs,SCE)出现一尖锐、灵敏的极谱波.钼含量在0.2～400 ng/mL范围内与波高呈线性关系,检测限为0.1 ng/mL.用多种电化学方法研究了极谱波的性质及电极反应机理,证明络合波为吸附波. 峰电流由中心离子Mo(Ⅴ)还原产生,Mo(Ⅵ)与络合剂的组成比为1∶1.方法用于自来水中痕量钼的测定,快速、灵敏、准确,结果满意.

Adsorptive catalytic polargraphic wave of the complex of molybdenum(Ⅵ)-8-hydroxy-5-sulfonic-quinoline complex is studied. Its peak potential is-0.30 V(vs,SCE). The optimum conditions are 5.0×10~(-3) mol/L HCl and NaNO_2, the detection limit and linear range of molybdenum(Ⅵ) are 0.1 ng/mL and 0.2~400 ng/mL respectively. Several electron chemical methods are used to prove that a polargraphic wave is a complex adsorptive one. The molar ration of molybdenum(Ⅵ) to 8-hydroxy-5-sulfonic in the complex is found to be 1∶1. The effect of more 8-hyd...