GC-MS-SIM对宝鸡市饮用水中8种SVOCs的测定

目的 研究建立宝鸡市饮用水源地硝基苯等8种半挥发性有机物（SVOCs）的分析方法,为相关部门决策提供依据.方法 以二氯甲烷液液萃取富集浓缩、TR-5ms非极性柱分离、单四极杆质谱仪检测及选择离子扫描模式测定了宝鸡市饮用水中8种SVOCs（硝基苯、二硝基甲苯、硝基氯苯、邻苯二甲酸二丁酯（（DBP）、邻苯二甲酸二（2-乙基已基）酯（BEHP）、p,p＆#39;-DDT、林丹、阿特拉津）.结果 在选择离子扫描模式下,在0.2～10.0 μg/L范围之内,8种SVOCs的浓度x（μg/L）与其峰面积之间存在良好的线性关系（R≥0.995）;平均回收率在73.35％～95.59％之间,在EPA8270方法中推荐的参考范围内.取样体积为500mL时,检出限在0.16～1.00 μg/L,宝鸡水样分析结果表明,8种SVOCs的含量除林丹外,均低于GB3838-2002检出限;相对标准偏差（RSD）在2.6％～8.6％之间,均在允许偏差之内.结论 液液萃取/GC/MS/SIM方法在线性范围（0.2～10.0μg/L）内,检出限、准确度和精密度表现良好,能够满足饮用水源地水质分析的要求.

Determination of 8 kinds of SVOCs in Baoji drinking water by GC/MS/SIM

Objective--To establish the analysis method of 8 kinds of semi-volatile organic com- pounds （SVOCs） in Baoji drinking water, and to provide basis for related decision-making depart- ment. Methods--The concentrations of 8 SVOCs （i.e. nitrobenzene, dinitrotoluene, nitrochloro- benzene, dibutyl phthalate （DBP）, bis （2-ethylhexyl） phthalate （BEHP）, p, p＇ -DDT, lindane and atrazine） were determined by CH2Cl2 liquid-liquid extraction, non-polar column separation with TR- 5ms, test of single quadrupole mass spectrometer and the scan mode of SIM. Results--In the mode of SIM and in the range of 0. 2 to 10. 0 μg/L, there existed.a good linear relationship （R≥0. 995） between the concentrations x （μg/L） and the peak areas of 8 SVOCs. The average recovery was within 73.35 % to 95.59 %, which is within the reference range of method EPA8270. When sampling volume was 0.5 L, the detection limit was within 0.16 to 1.0μg/L, which is lower than GB3838-2002 except for lindane, and the relative standard deviation is within 2.6% to 8.6%, its deviation was within the permissive range. Conclusion--The method of liquid-liquid extraction/GC/MS/SIM showed better linear range between 0.2 μg/L and 10.0μg/L, detection limit, accuracy and precision can satis- fy the request of water quality analysis.