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研究了在弱酸性介质中，以氨三乙酸为活化剂，利用锰（Ⅱ）催化高碘酸钾氧化二苯卡巴肼的指示反应，用卒取平衡控制反应时间和水相中二苯卡巴肼的浓度及反应程度，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０．１０～５０μｇ／Ｌ；检出限为８．７ｘ－８ｇ／Ｌ。用于水、茶叶和粮食中痕量锰的测定，结果满意。探讨了反应机理，建立了动力学方程式。
In a weakly acidic medium, the reaction of dipotassium carbohydrate with potassium periodate catalyzed by manganese (Ⅱ) with nitrilotriacetic acid as activator was studied. The equilibrium reaction time and the diphenylcarbazide Concentration and reaction degree, a new method for the determination of trace manganese by catalytic spectrophotometry was established. The linear range of the method was 0.10 ~ 50μg / L with the detection limit of 8.7x-8g / L. Used in the determination of trace manganese in water, tea and grain with satisfactory results. The reaction mechanism was discussed and the kinetic equation was established.