硒（Ⅳ）─碘化钾─孔雀绿显色体系的研究与应用

Highly Sensitive Colour System of Selenium (Ⅳ)-Potassium Iodide-Malachite Green and Its Analytical Application

研究了硒（Ⅳ）─碘化钾─孔雀绿高灵敏显色体系。确定了该体系用分光光度法测定的最佳条件，并对反应机理作了进一步论证。该方法适用于室温操作，重复性好，摩尔吸光系数为１．２×１０５１·ｍｏｌ（－１）·ｃｍ（－１），可用于直接测定水样中痕量硒的含量。

The highly sensitive colour system of Selenium (Ⅳ) -Potassium iodide-Malachite green was studied. The optimum conditions of this system using spectrophotometry were determined, and the reaction mechanism was discussed. It is feasible to use this method at room temperature. Both of the sensetivity and reproducibility are satisfactory. The molar absorptivity is 1.2 × 10￣5 1 · mol￣(-1)· cm￣(-1).Beer's law is obeyed in the range of 0～ 0.32μg/ml. It has been successfully used in determinining the trace selenium presented in water.