Di Shanshan, Shi Shengchao, Xu Peng, Diao Jinling, Zhou Zhiqiang
Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing, 100193, People's Republic of China.
Bull Environ Contam Toxicol. 2015 Jul;95(1):67-72. doi: 10.1007/s00128-015-1538-0. Epub 2015 May 3.
Four commonly applied extraction techniques for organochlorine pesticides, microwave-assisted extraction (MAE), accelerated solvent extraction (ASE), quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction and ultrasonic solvent extraction, were applied on soil samples in order to evaluate their performances. The extracts were analyzed by GC-ECD and confirmed by GC-MS/MS. The MAE and QuEChERS extraction methods generally yielded higher results compared to the ultrasonication and ASE methods, while the lowest recovery (56.8 %) for o,p'-DDD was obtained using the QuEChERS method. The MAE method was further applied to six different soils from Beijing. In the soil samples only α-endosulfan and β-endosulfan were not detected. The ratios of α-HCH/γ-HCH and α-HCH/β-HCH indicated HCH residues likely originated from historical use of HCHs, and that technical HCHs were not likely being currently applied in Beijing.
为评估其性能，将常用于有机氯农药的四种提取技术，即微波辅助萃取（MAE）、加速溶剂萃取（ASE）、快速、简便、廉价、高效、耐用且安全（QuEChERS）萃取和超声溶剂萃取，应用于土壤样品。提取物通过气相色谱 - 电子捕获检测器（GC - ECD）进行分析，并通过气相色谱 - 串联质谱（GC - MS/MS）进行确证。与超声萃取和ASE方法相比，MAE和QuEChERS萃取方法通常产生更高的结果，而使用QuEChERS方法获得的o,p'-滴滴滴的回收率最低（56.8%）。MAE方法进一步应用于来自北京的六种不同土壤。在土壤样品中，仅未检测到α-硫丹和β-硫丹。α-六氯环己烷/γ-六氯环己烷和α-六氯环己烷/β-六氯环己烷的比率表明，六氯环己烷残留可能源于六氯环己烷的历史使用，并且目前北京不太可能正在使用工业用六氯环己烷。
