萃取催化动力学光度法测定痕量锰

Determination of Trace Manganese by Extraction Catalytic Kinetic Spectrophotometry

研究了在pH9．7的介质中，利用Mn（2＋）催化过氧化氢氧化水杨醛显色的指示反应，用萃取平衡控制反应时间及反应程度，通过测量500nm下水相的吸光度，建立了萃取催化光度法测定痕量锰的新方法方法的线性范围为0．020－0．20μg／ml，检出限为0．010μg／ml用于水样中痕量锰的测定，结果满意。

A new extraction catalytic kinetic spectrophotometric method for the determination of trace manganese is studied. The method is based on the manganese(Ⅱ) catalyzed oxidation of salicyladehyde by hydrogen peroxide at pH 9. 7 medium. The reaction time and the reaction degree are controlled by extraction equilibrium. The ahsorbance of equeous phase is measured at 500nm. The linear range of the method is 0. 020-0. 20μg/ml. The detection limit is 0. 10μg/ml. The method has been applied to the determination of trace manganese in water samples with satisfactory results.