水中苯胺等有机氮化物光氧化测定的研究

Study on Photo Oxidation Determination of Organic Nitrogen in Water

本文改进了光氧化法测定松花江水中低浓度有机总氮.使用H_(3)O_(3)和K_(2)S_(2)O_(8)混合氧化剂,缩短了辐照时间;简化了试样的pH值的控制方法;使水中苯胺、硝基苯等的光解达到定量的要求。还讨论了光解过程中的干扰情况及被测物浓度和结构的影响。

UV-irradiation has been known as an effective method for measuring the amount of total organic nitrogen of low concentration in natural water.In our work we have made some improvements:First,we have found that K_(2)S_(2)O_(8)and H_(2)O_(2)as a mixed oxidant is more effective than other oxidants so that the irradiating time may be shortened from 2-4 hours to only 20 minutes.Secondly,the procedure for adjusting the pH has been simplified.The pH can be maintained in basic solution without the two-step irradiation or the addition of buffers.Thirdly,the quantitative recoveries of the common pollutants in solution,such as aniline and nitrobenzene,can be obtained.In this paper we also discuss the interference problems during the irradiating process,the influences of the concentration and structure of organic nitrogen compounds in the photo-oxidation process.Finally,we discuss the use of this method to analgze samples taken from the Songhuajiang River.