对二氯苯生产中的多氯联苯副产物排放与生成机制研究  

Formation Mechanism of by-Product PCBs in the p-DCB Production

作　　者：李素梅[1] 朱琦[2] 刘平[3] 尚屹[2] 田亚静[2] 姚薇[2] 朱维耀[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]中华人民共和国环境保护部,北京100035 [3]江苏扬农化工集团有限公司,扬州225009

出　　处：《环境科学》2009年第7期2093-2098,共6页Environmental Science

基　　金：环保公益性行业科研专项项目

摘　　要：对国内某化工企业一系列对二氯苯样品和日本某企业对二氯苯样品的PCBs副产物的含量和生成机制进行了研究.在该企业对二氯苯样品检测到了62～781ng/g的PCBs,WHO-TEQ最高达到了0.24pg/g,在日本样品中PCBs总量也达到了881ng/g,说明PCBs副产物在对二氯苯生产中是一个比较普遍的现象.在对二氯苯样品中,PCB31是主要的PCBs单体,最高占到了PCBs总量的98.5%.对二氯苯样品中都是TrCBs含量最高,其次是TeCBs和DiCBs以及PeCBs;而氯苯样品中则是MoCBs含量最高,占到了PCBs总量的73.5%.本研究还对各主要PCBs化合物的生成机制进行了探索,发现多氯苯缩合生成PCBs的过程受到多氯苯的浓度和氯对苯环的定位影响,并得到了试验的证实.A typical p-DCB production process was selected in this study. A series of p-DCB product samples, 1 Japanese sample and 1 chlorobenzene sample were collected and analyzed for by-product polychlorinated biphenyls （PCBs）. It is a common phenomenon that by-product PCBs exists in the p-DCB production process. The PCBs levels in the p-DCB samples were 62-781 ng/g and the highest WHO-TEQ in the process was 0.24 ng/g, while the PCBs level in the Japanese sample reached 881 ng/g. PCB31 was the dominate PCB congener in all the p-DCB samples with the maximum 98.5% of the total PCBs. Maximum content of PCBs was TrCBs in the p-DCB samples with the next TeCBs, DiCBs and PeCBs, while MoCBs were the highest in the chlorobenzene sample. Furthermore, a formation mechanism of PCBs in the production process was proposed and proved by the analysis result. It suggested that the formation of PCBs form the condensation of polychlorobenzenes had a relation with the concentration of polychlorobenzenes and the chlorine position in the benzene ring.

关 键 词：对二氯苯 多氯联苯 副产物 持久性有机污染物 

分 类 号：X592[环境科学与工程—环境工程]