废塑料再生利用二噁[口英]污染特征及暴露风险  

Pollution characteristics and exposure risk of PCDD/Fs from plastic waste recycling industry

作　　者：杨艳艳 李世平 谢丹平 付建平 丁紫荣 韩静磊 张素坤 YANG Yan-yan;LI Shi-ping;XIE Dan-ping;FU Jian-ping;DING Zi-rong;HAN Jing-lei;ZHANG Su-kun(South China Institute of Environment Sciences,Ministry of Ecology and Environment,Guangzhou 510655,China)

机构地区：[1]生态环境部华南环境科学研究所,广东广州510655

出　　处：《中国环境科学》2023年第9期4926-4933,共8页China Environmental Science

基　　金：中央级公益性科研院所基本科研业务专项资金资助项目(PM-zx703-202112-338)。

摘　　要：对我国某省废塑料再生利用企业排放废气和厂区环境空气中二噁[口英](PCDD/Fs)污染水平、排放特征及其暴露风险进行了初步研究.结果表明,塑料再生利用行业排放废气中PCDD/Fs毒性当量浓度(以I-TEQ计,下同)为0.0796~0.478ng/m3,均值为0.194ng/m3,总体排放水平高于我国现行标准限值(0.1ng/m3);厂区环境空气中PCDD/Fs毒性当量浓度为0.256~2.15pg/m3,对照点环境空气中PCDD/Fs毒性当量浓度为0.0356~0.178pg/m3.指纹谱图特征显示,所有废气和环境空气样品中PCDD/Fs均以高氯代单体为主,主要为八氯二苯并呋喃(OCDF)、八氯二苯并对二噁[口英](OCDD)、七氯二苯并呋喃(1,2,3,4,6,7,8-HpCDF)和七氯二苯并对二噁[口英](1,2,3,4,6,7,8-HpCDD),最大毒性贡献单体均为五氯二苯并呋喃(2,3,4,7,8-PeCDF).厂区环境空气中PCDFs浓度高于PCDDs,具有热源影响特征.对废塑料再生利用行业厂区二噁[口英]呼吸暴露风险研究表明,其总体处于较为安全的水平,部分个体的呼吸暴露贡献率超过了评价限值,应引起重视.The pollution level,emission characteristics and exposure risk of PCDD/Fs from a number of waste recycling enterprises were investigated in a certain province of China.The results showed that the TEQ values of PCDD/Fs in the flue gas samples ranged from 0.0796 to 0.478ng/m3(I-TEQ)with an average value of 0.194ng/m3(I-TEQ).In addition,the level of PCDD/Fs in plastic waste recycling industry was higher than the current standard limit(0.1ng/m3).The concentrations of PCDD/Fs in the ambient air samples of waste recycling enterprises area ranged from 0.256 to 2.15pg/m3(I-TEQ)and the reference point ranged from 0.0356 to 0.178pg/m3(I-TEQ).The results of fingerprint analysis showed that high-chlorinated monomers including OCDF,OCDD,1,2,3,4,6,7,8-HpCDF and 1,2,3,4,6,7,8-HpCDD were the primary PCDD/F congeners in the flue gas and ambient air samples.2,3,4,7,8-PeCDF was the most dominant congener contributing to TEQ values.The concentration of PCDFs was higher PCDDs in the ambient air samples,which was characterized by heat source.The exposure risk assessment suggested that human exposure to PCDD/Fs via inhalaition for the residents living in the studied area was at a relatively safe level.The contribution rate of respiratory exposure to PCDD/Fs for some individuals exceeded the evaluation standard and deserves more attention.

关 键 词：废塑料 再生利用 二噁[口英] 污染特征 暴露风险 

分 类 号：X511[环境科学与工程—环境工程]