水体中甲基汞检测系统的研制

Development of a Detection System for Methylmercury in Water

基于“吹扫捕集-气相色谱-介质阻挡放电裂解-冷原子荧光光谱”方案,设计了一款水体中甲基汞检测系统。设计的原子化器采用介质阻挡放电裂解模块,较传统的剧烈氧化还原反应原子化器具有体积小、功耗低和裂解效率高等优势。实验中,分别对0、10、20、50、100、500以及1000 pg的标样甲基汞溶液进行5次重复检测,并建立标样甲基汞峰面积平均值校准曲线,计算出相对标准差(RSD)在1.29%~3.40%之间,R为0.994。实验结果表明,该系统能够实现甲基汞的检测,满足操作简单、低成本、高性能的设计要求,适合用于中小实验室的教学仪器。

A detection system for methylmercury in water has been designed.The system is based on the design scheme of“Purge and Trap(PT)-Gas Chromatography(GC)-Dielectric Barrier Discharge(DBD)-Cold Vapor Atomic Fluorescence Spectrometry(CVAFS)”.Compared with the traditional violent oxidation-reduction reaction atomizer,the atomizer in this design adopts the dielectric barrier discharge cracking module,which has the advantages of small size,low power consumption and high cracking efficiency.In the experiment,the standard methylmercury solutions of 0,10,20,50,100,500 and 1000 pg are tested for five times,and the calibration curve of the average peak area of methylmercury is established.The relative standard deviation(RSD)is calculated to be between 1.29%and 3.40%and the correlation coefficient(R~2)is 0.994.Experimental results show that the system can detect methylmercury,meets the design requirements of simple operation,low cost,and high performance,and is very suitable to use as a teaching instrument in small and medium laboratories.