催化动力学分光光度法测定痕量锰(Ⅱ)的研究——钙红-过氧化氢体系

Studies on the Catalytic-Kinetic Spectrophotometric Determination of Trace Amounts Manganese (II)——Cal·Red-Hydrogen Peroxide System

本文筛选出锰的新指示反应，据此建立了一个有高灵敏和选择性的催化动力学分析法，并就反应动力学有关问题作了讨论。

A very sensitive eatalytic-kinetic spectrophotometric method for the determination of trace amounts of Mn(Ⅱ) is reported. It is a new indicator reaction based on the decreasing in the absorbance of Cai·Red(OR) with hydrogen peroxide which is catalyzed by Mn (Ⅱ) on heating in Clark-Lubs buffer solution (pH9.8). The reaction is first- order in CR or Mn(Ⅱ) and the apparent activation energy of the catalytic reaction is found to be 115.31k·J/mol. This method has been applied fo the determination of trace amounts Mn(Ⅱ) in human hair and tap water. The coefficient variations are 4.95 and 5.63% respectively.