便携式GC法测定石油污染地地下水中苯、乙苯和二甲苯

摘要

采用便携式气相色谱法测定石油污染地地下水中苯、乙苯和二甲苯，通过试验选择出测定的最佳色谱条件和适宜内标物，并对样品平衡时间、NaCl用量、取样后 VOA瓶中液-气体积比等条件进行优化。试验表明，该方法在0 mg/L～2．00 mg/L范围内线性良好，相关系数均＞0．98；方法检出限为0．05 mg/L ～0．15 mg/L。用该方法和吹扫捕集-气相色谱/质谱联用法同时测定实际水样，两种方法测定结果具有良好的一致性。%A method for determination of benzene,ethylbenzene and xylene in polluted groundwater by porta-ble gas chromatography using internal standard was established.The effects such as the choice of internal standard, amount of salt,equilibration time,ambient temperature,the volume ratio of liquid-gas,the number of repeated meas-urement were discussed.The results show that the internal standard method was effective to control the changes of environmental conditions.Xylene were separated by CP-Wax 52 CB(4 m)capillary column.The detection limits of method were 0.05 mg/L~0.15 mg/L,the linear ranges were 0 mg/L~2.00 mg/L.The correlation of test data be-tween this method and purge-trap-gas chromatography/mass spectrometry were good.This method can be used for the site screening and determination of benzene,ethylbenzene and xylene in polluted water.