利用溶解度参数选择有机溶剂提取土壤中多种有机氯农药

Selection of Extraction Solvents with Based on Solubility Parameters for Extracting the Organochlorine Pesticides in Soils

采用基团贡献法计算了提取溶剂(正己烷、二氯甲烷、正己烷 -甲醇(体积比4∶1)、正己烷 -丙酮(体积比1∶1)、正己烷 -二氯甲烷(体积比1∶1))和有机氯农药(o,p′_DDT,o,p′_DDE ,o,p′_DDD ,α_endosulfan,endrin,HCB)的色散溶解度参数 (δd)、极性溶解度参数 (δp)和氢键溶解度参数 (δh) ,运用溶解度参数的理论筛选有机溶剂提取江西红壤中多种有机氯农药。研究表明正己烷 -甲醇(体积比4∶1)和正己烷 -丙酮(体积比1∶1)是提取江西红壤中o,p′_DDT,o,p′_DDE ,o,p′_DDD多种有机氯农药的最佳提取溶剂(回收率大于82 %) ,对α_endosulfan ,endrin,HCB的提取也能满足检测需要(回收率大于75%)。

The solubility parameters,including dispersion coefficient(δ d ),polarity(δ p )and hydrogen bonding(δ h ),of extraction solvents(including hexane,dichloromethane,hexane-methanol(4∶1by volume,the same below),hexane-acetone(1∶1),hexane-dichloromethane(1∶1))and organochlorine pesticides were estimated using a group contribution method,and then used to prediction the optimal extraction solvents to exˉtract the typical organochlorine pesticides from the Jiangxi red soil.The solvents such as hexane-methanol(4∶1)and hexane-acetone(1∶1)were determined selected as ideal extraction solvents to extract o,p′- DDT,o,p′-DDE and o,p′-DDD with high recoveries(>82%).Besides,these solvents were used to extractα-endosulfan,endrin and HCB with the reliable recoveries(>75).The results obtained with ultrasonic extracˉtion were in accordance with the estimated predictions from conclusion by the solubility parameters.