铜(Ⅱ)催化硫脲还原硫氰酸盐光度法测定钼

Spectrometric Determination of Mo (Ⅵ) with the Reaction of Thiocarbamide Reducing Rhodanate on Catalysis of Cu(Ⅱ)

在硫酸介质中，以Fe2＋和Cu2＋作催化剂，用硫脲还原Mo（Ⅵ）为Mo（Ⅴ），Mo（Ⅴ）与硫氰酸盐生成橙黄色络合物进行测定。有色络合物λmax为470nm，ε＝1．2×104L·mol－1·cm－1，钼量在0－140μg／50mL范围内符合比尔定律。方法用于复杂物料中微量钼的测定，结果满意。

with Fe(Ⅱ) and Cu (Ⅱ) as the catalyzers, Mo (Ⅵ) is reduced to Mo(Ⅴ) by thiocarbomide in sulphoacid medium. Mo(Ⅴ) reacts with rodanate to form and orange- yellow complex. Waximum absorbance of the complex is at 470 nm with a melar absorptivity of 1.2 x 104 L.mol-1.cm-1. Bear's law is obeyed over the range of 0~ 140 mg/50ml Mo(Ⅵ). This method has been applied to the determination of microscale Mo(Ⅵ) in some complicated samples.