光化学-荧光分析法研究(Ⅱ)——水中Cr(Ⅵ)的光化学-荧光动力学分析法测定

Studies on the Photochemical-Fluorimetric Method (Ⅱ)——Detarmination of Trace Chromium (Ⅵ ) in Water by Using Catalytic-Kinetic Photochemical Fluorimetry

根据Cr(Ⅵ)对利凡诺(R)光氧化反应的催化作用。提出了Cr(Ⅵ)的光化学荧光催化动力学分析新方法。该法灵敏度高、选择性较好,Cr(Ⅵ)含量在1～200ng/mL呈良好的线性关系。直接测定池塘水和污水中Cr(Ⅵ)效果良好。对该反应机制进行了初步探讨,确立了反应动力学方程。

A new catalytic-kinetic photochemical fluorimetry for the determination of Cr(Ⅵ) in water is discrtibed. The method is based on the catalytic effect of Cr(Ⅵ) on the photo-oxidation reaction of Rivanol. A better linear relationship curve was obtained over the range of 1 ~200 ng/mL Cr(Ⅵ) and the relative standard deviation of the determination was 2. 3. This method has been applied to the direct determination of trace amounts of Cr(Ⅵ) in water with a good result. The mechanism for the photo-oxidation reaction of Rivanol catalyzed by Cr(Ⅵ) was discussed and a kinetic equation was given.