微波碱解法消除土壤样品多氯联苯测定中有机氯农药的干扰  

Microwave-assisted Alkaline Degradation Method for the Elimination of Organochlorine-pesticide Interference on the Determination of Polychlorinebiphenyls in Soil

作　　者：何小青[1] 李攻科[1] 熊国华[1] 张展霞[1] 

机构地区：[1]中山大学化学系,广州510275

出　　处：《分析化学》2000年第1期26-30,共5页Chinese Journal of Analytical Chemistry

基　　金：广东省自然科学基金;博士启动基金;教育部留学回国人员科研启动基金

摘　　要：有机氯农药（Ops）严重干扰多氯联苯（PCBs）的测定，本文采用微波加热技术将Ops碱解，在优化的实验条件下能完全消除六六六（HCH）、双对氯苯基三氯乙烷（DDT）、二氯二苯二氯乙烷（DDD）的干扰，二氯二苯二氯乙烯（DDE）、艾试剂（Aldrin）、狄试剂（Dieldrin）也有一定数量的减少，狄试剂经浓硫酸处理后其干扰完全消除。通过对合成土壤样品的处理，表明该法能有效地碱解Ops，消除其对测定PCBs的干扰；并能在碱解Ops的同时萃取PCBs，PCBS回收率为84．1％，相对标准偏差为2．7％。本方法快速、高效，减少了有机溶剂的使用量。A new and simple microwave-assisted alkaline degradation (MAAD) method for the elimination of organochlorine - pesticides interference on the determination of polychlorinebiphenyls (PCBs ) in soil by GC is presented. Under optimized conditions, α-HCH, β-HCH, γ-HCH, δ-HCH, o, p'- DDT, p, p'-DDD and p, p' -DDT could be degraded completely, and p, p'-DDE, Aldrin and Dieldrin partly, but Dieldrin could be compltely degraded by using concentrated sulphuric acid. The method was evaluated by analying the spiked soil sample. The mean recovery obtained was 84.1 % and the RSD was 2.7%. Experimental meults also indicate that the degradation of the intferences and the etraction of the target analytes, PCBs could be carried out simultaneously. Compared with the traditional methods,the MAAD method is a rapid, efficient, and solvent-saving.

关 键 词：土壤 多氯联苯 有机氯农药 污染物 微波碱解法 

分 类 号：O656[理学—分析化学]