钼(Ⅵ)-苦杏仁酸体系的吸附伏安行为

Studies on Adsorptive Voltammetry Behaviour of Molybdenum ( Ⅵ )-Mandelic Acid System

本文对Mo(Ⅵ)-苦杏仁酸体系的吸附伏安行为做了系统的研究。测定了吸附量与络合物的形成常数,在此基础上建立了钼的吸附溶出伏安法。

In this paper, a study of the adsorption voltammetry behaviour of Mo(Ⅵ )-mandelic acid (HL) is made systematically. The complex H2MoO4L22- can be adsorbed on the HMDE. The conditional constant of complex formation, 5. 7×109, maximum amount of adsorption, 8×10-7 mol/m2, and coefficient of adsorption, 1. 7 × 104 m3/mol, were determined in the medium of .2. 5 × 10-3 mol/L H2SO4. A procedure for determining Mo by utilizing the adsorptive stripping current of the ad-sorptable complex is developed. The limit of detection is 5× 10-10 mol/L Mo and the linear relationship between the current and concentration of Mo(Ⅵ) is in the range 1× 10-9-8× 10-8 mol/L.