辽河中下游水体中多氯有机物的残留调查

Investigation of polychlorinated organic compounds (PCOCs) in middle and lower reaches of Liaohe River

采用Ｃ１８固相萃取和索氏提取的方法，经气相色谱分析，调查了辽河中下游水体中多氯有机物（ＰＣＯＣｓ）的残留情况、共检出１３种有机氯农药和４种多氯联苯（ＰＣＢｓ）．在水中和沉积物中，所检出的ＰＣＯＣｓ浓度分别低于９１．３ ｎｇ／Ｌ和２８．６ｎｇ／ｇ。这一浓度低于２０世纪７０～８０年代蓟运河（汉沽区段）和松花江（哨口一松花江村段）水体中的ＰＣＯＣｓ的检出浓度．与国外在２０世纪９０年代对部分水体的ＰＣＯＣｓ残留调查结果相比，辽河中下游水中ＰＣＯＣｓ的浓度比国外部分水体水中ＰＣＯＣｓ浓度稍高，沉积物中ＰＣＯＣｓ的浓度与国外部分水体中的相应浓度接近。

By C_(18) solid phase extraction and Soxhlet extraction, with GC analysis, the levels of polychlorinated organic compounds (PCOCs) in middle and lower reaches of Liaohe myer were investigated. There are 17 kinds of PCOCs detected including 13 organochlorine peshcides and 4 polychlorinated biphenyls (PCBs). The results showed that the concentra. non of PCOCs in the water and the sediment of Liaohe myer were lower than 91.3 ng/L and 28.6ng/g respectively; and their residue levels were lower than those of Jiyun River (Hangu section) and Songhuajiang myer (from Shaokou to Songhuajiang Cun section) investigated in 70's and 80's,20 century. However, these concentrations in Liaohe myer water were slightly higher than those of some water bodies in 90's, 20 century; while those in the sediments were nearly eqral in other countries investigated.