摘要
建立加速溶剂萃取(ASE)、固相柱净化结合双电子捕获检测器(ECD)气相色谱法同时测定土壤中18种多氯联苯(PCBs)的方法。比较了不同的萃取方式、萃取溶剂,以及不同的净化方式等对提取净化效率的影响。18种多氯联苯在2.00~500μg·L^(-1)质量浓度范围内线性良好,线性相关系数为0.9992~0.9999,方法检出限为0.02~0.04μg·kg^(-1),空白石英砂加标回收率为75.2%~108%,相对标准偏差为0.9%~5.1%。通过对变电站实际土壤样品检测,能够准确定量污染土壤中多氯联苯水平,变电站实际土壤样品中18种多氯联苯的加标回收率为70.6%~102%,相对标准偏差为2.3%~8.7%。该方法简单、快速,回收率和检出限均能满足质量控制要求,适用于污染源场地内土壤风险的筛查和管控。
A method for the determination of 18 Polychlorinated Biphenyls(PCBs)in Soil by using accelerated solvent extraction(ASE)and Silicagel column cleanup with Gas Chromatography-Dual Electron Capture Detection,and the effects of different extraction methods,Extraction solvent and cleanup methods on standard recovery were compared.The linearity of the method ranged from 2.00μg·L^(-1) to 500μg·L^(-1) for 18 PCBs,with correlation coefficients ranging from 0.9992 to 0.9999.The detection limits for 18 PCBs were 0.02~0.04μg·kg^(-1).The standard recovery of blank quartz sand is 75.2%~108%,the relative standard deviation is 0.9%~5.1%.Through the detection of actual soil samples in substations,the level of PCBs in contaminated soil can be accurately quantified,The standard recovery of soil samples in substations is 70.6%~102%,the relative standard deviation is 2.3%~8.7%.The method is simple and rapid,and the recovery rate and detection limit can meet the quality control.It is suitable for screening and control of soil risk in pollution source sites.
作者
周旭平
杨开放
田芳
ZHOU Xu-ping;YANG Kai-fang;TIAN Fang(Zhenjiang Environmental Monitoring Center of Jiangsu Province,Zhenjiang 212000,China)
出处
《化学研究与应用》
CAS
北大核心
2023年第4期968-974,共7页
Chemical Research and Application
关键词
加速溶剂萃取
气相色谱法
土壤
多氯联苯
accelerated solvent extraction
gas chromatography
soil
polychlorinated biphenyls