摘要
本文以土壤中多环芳烃为研究对象,利用超声波产生的机械效应和空化效应,使其从土壤介质表面脱离形成游离状态下的多环芳烃,进入有机溶剂后,形成多环芳烃在土壤介质和有机溶剂之间的动态平衡,进而实现多环芳烃的萃取。通过有机溶剂的筛选和超声萃取优化实验,发现体积比为1∶1的二氯甲烷和正己烷,提取体积为50 mL、超声时间20 min和水浴温度35℃时,对土壤中的多环芳烃的萃取效果最高为82.1~106%。对10.0 g左右的土壤进行低、中、高溶度的加标测试时,16种多环芳烃的加标回收率在85~115%之间,线性回归系数大于0.995,方法检出限在0.001μg·g^(-1)~0.027μg·g^(-1),相对标准偏差在1.98~5.13%之间。这种提取方法实现了绿色低污染、高效准确和低成本的测试要求。
Polycyclic aromatic hydrocarbons(PAHs)in soil were taken as the research object.The mechanical effect and cavitation effect produced by ultrasonic wave were used to separate them from the surface of soil medium to form free PAHs.The PAHs in free state entered into organic solvents producing PAHs dynamic equilibrium in soil medium and extracted the PAHs from soil.Through the screening and optimization experiments of organic solvents,the best conditions were dichloromethane and n-hexane with a volume ratio of 1∶1,the extraction volume of 50 mL,ultrasonic time of 20 min and water bath temperature of 35℃.The extraction of polycyclic aromatic hydrocarbons from the soil had the highest effect(82.1~106%).As the reference materials with low,medium and high solubility were added into 10.0 g soil,the recoveries of 16 PAHs ranged from 85%to 115%,and the linear regression coefficients of greater than 0.995.The detection limits were 0.001μg·g^(-1)~0.027μg·g^(-1),and the relative standard deviations were between 1.98%and 5.13%.This project had achieved the requirements of green,low pollution,high efficiency,accuracy and low cost.
作者
颜常盛
许鹏
齐玲
赵晓晖
黄剑
YAN Chang-sheng;XU Peng;QI Ling;ZHAO Xiao-hui;HUANG Jian(Nuclear Industry 270 Institute,Analysis and Test Center,Nanchang 330200,China)
出处
《化学研究与应用》
CAS
CSCD
北大核心
2021年第6期1051-1057,共7页
Chemical Research and Application
基金
核工业二七〇研究所自主科研项目(270202001)资助。
关键词
多环芳烃
超声
气质联用仪
绿色低污染
polycyclic aromatic hydrocarbons
ultrasound
GC-MS
green and low pollution
