对碘偶氮氯膦催化光度法测定痕量锰  

Catalytic Spectrophotometric Determination of Trace Amounts of Manganese(Ⅱ) with Chlorophosphonazo-PI

作　　者：王淑志[1] 

机构地区：[1]临沂职业学院,山东临沂276017

出　　处：《煤炭技术》2011年第11期223-225,共3页Coal Technology

摘　　要：在pH=4．74的HAc—NaAc缓冲溶液中，Mn（Ⅱ）强烈催化KIO4氧化对碘偶氮氯膦褪色，确定了反应的最佳条件，测定了反应级数、表观速率常数和表观活化能，确立了反应速率方程，探讨了反应机理，建立了一种测定痕量锰的新方法。该方法的检测限为0．05ng／mL，线性范围为0．05～2．5ng／mL。方法选择性好，直接用于自来水中痕量锰的测定，结果满意。In this paper, the catalytic kinetics of the reaction system of Chlorophosphonazo-PI-Mn （Ⅱ）-KIO4 System is studied. It is found that traces of manganese （Ⅱ） catalyze the oxidation of Chlorophosphonazo-PI by potassium periodete in an HAe-NaAc buffer medium of pH 4.74. The optimal reaction conditions, the order of reaction, the apparent reaction rate constant ,the apparent activation energy, and the reaction rate equation were determined. A high-sensitivitycatalytic kinetic photometric method for determining traces of manganese is described. The sensitivity of method is 0.05ng/ml. The linear range of manganese in water with satisfactory results.

关 键 词：催化光度法 对碘偶氮氯膦 锰 

分 类 号：O657.3[理学—分析化学]