基于间苯二酚分光光度法的总氮检测方法

A total nitrogen detection method based on resorcinol spectrophotometry

针对目前水资源总氮检测系统成本高和稳定性差的问题,参考《地表水环境质量标准》(GB 3838—2002),设计了一种基于间苯二酚分光光度法的低成本的水中总氮检测系统。通过测定间苯二酚与水中氮及氮氧化合物反应后溶液的吸光度,建立了光电检测信号与总氮浓度之间的关系,从而测得水体中总氮含量。实验结果显示:基于间苯二酚分光光度法的水中总氮检测方法的重复性好,精度高。将该检测系统与商用总氮传感器的测定结果进行比较,二者的最大相对误差小于8%,表明所设计的检测系统具有较好的测量准确性。

In view of the problems of high cost and poor stability of total nitrogen detection systems for use with water resources,a low-cost detection system for total nitrogen in water based on resorcinol spectrophotometry has been designed with reference to the“Surface Water Environmental Quality Standard”(GB 3838—2002).The relationship between the photoelectric detection signal and the total nitrogen concentration was established by measuring the absorbance of the solution after the reaction of resorcinol with nitrogen and nitrogen oxides in water in order to measure the total nitrogen content in water.The experimental results show that the total nitrogen detection method based on resorcinol spectrophotometry has good repeatability and high precision.Compared with the results using a commercial total nitrogen sensor,the maximum relative error of the two methods is less than 8%,which indicates that our detection system has good measurement accuracy.