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.
出处
《煤炭技术》
CAS
北大核心
2011年第11期223-225,共3页
Coal Technology
关键词
催化光度法
对碘偶氮氯膦
锰
catalytic spectrophotometric method
chlorophosphonazo-Ph manganese
