岩溶地区垃圾渗透液中36种挥发性有机物的测定

Determination of 36 volatile organic compounds in landfill leachate in karst area

应用吹扫捕集-气相色谱-质谱法测定岩溶地区垃圾渗透液中36种挥发性有机物(VOCs)的含量。获取样品溶液5 mL于吹扫瓶中,利用TELEDYNE TEKMAR型吹扫捕集直接进样,经DB-VRX毛细管色谱柱分离、电子轰击电离(EI)全扫描检测,选择特征离子,再用外标法进行定量测定。结果表明:36种挥发性有机物的质量浓度在1～100μg·L^(-1)范围内,与其峰面积呈线性关系,方法检出限在0.03～0.27μg·L^(-1)之间,加标回收率在88%～110%之间,相对标准偏差(n=7)在2.32%～6.51%之间。

The area of karst accounts for about 1/3 of the total area of China,and the amount of groundwater resources account for about 1/4 of the total water resources.Karst groundwater is an important source of water in China,which is also a major source of drinking water in Southwest China.In recent years,with the acceleration of urbanization,the scale of cities has been expanding,the population has been growing,and the living rubbish and waste water generated by urban residents have been constantly increasing.A large amount of waste water and landfill leachate is discharged directly without treatment and infiltrated into the underground through infiltration and burst irrigation,which seriously threatened the quality of underground water resources and the health of people downstream.In this paper,the content of 36 volatile organic compounds(VOCs)in landfill leachate were analysed by method of purge and trap Gas Chromatography-Mass Spectrometry(GC-MS).5 mL of sample solution was obtained in the purge and trap bottle,and the samples were directly injected using TELEDYNE TEKMAR type purge and trap into the instrument for GC-MS analysis.The samples were separated by DB-VRX GC column,and then detected by the full scanning mode with positive electron ionization.The ion mass were selected and quantified by external standard method.The results showed that,the mass concentration of 36 VOCs was linear with the peak area in the range of 1-100μg·L^-1.The method detection limit found for 36 VOCs test were in the range of 0.03-0.27μg·L^-1.The spike recovery were performed by additional mixed standard of 36 VOCs,and the results were in the range of 88%to 110%,with RSD(n=7)ranged from 2.32%to 6.51%.The results showed that a few VOCs were found in the landfill leachate.