便携式GC-MS仪快速测定水中硝基苯及其在应急监测中的应用

采用便携式GC-MS仪快速测定水中硝基苯,通过优化水中离子强度和顶空加热时间,使方法在0μg/L^300μg/L范围内线性良好,方法检出限为2.5μg/L。标准溶液6次测定结果的RSD为7.8%~10.9%,实际水样的加标回收率为80.7%~103%。同步测定试验表明,硝基苯与7种苯系物分离良好。与国标方法对比,该方法单个样品测定时间由2 h缩短为15 min。将该方法用于应急监测工作中,及时有效的数据可为污水处理及事故调查提供分析和研判依据。

Portable GC MS for Rapid Detection of Nitrobenzene in Water and Its Application in Emergency Monitoring

A new method of portable gas chromatography coupled with mass spectrometry(GC-MS)was established to rapidly analyze nitrobenzene in water.Ion intensity in solution and heating time of headspace were optimized.Results showed that the concentration of nitrobenzene in water had good linear relationship with the chromatographic peak area in the range of 0μg/L^300μg/L.The method detection limit was 2.5μg/L.The relative standard deviations of standard solution by 6 duplicate measurements were between 7.8%and 10.9%,the recoveries were between 80.7%and 103%(n=6).Furthermore,it was found out that Nitrobenzene and seven kinds of VOCs could be separated effectively by synchronous determination.Compared with the national standard method,the determination time of this method for single sample was greatly shortened from 2 hours to 15 minutes.When applied in emergency monitoring,this method could provide timely and effective data for the investigation and handling of pollution accidents.