Environmental transformation and hazards of decachlorobiphenyl on suspended particles under sunlight irradiation

作     者：Xu, Jianqiao Wei, Junyan Guo, Ruixue Zhang, Shengnan Teng, Xiaolei Wang, Zunyao Qu, Ruijuan 

作者机构：Nanjing Univ Sch Environm State Key Lab Pollut Control & Resources Reuse Nanjing 210023 Jiangsu Peoples R China 

出 版 物：《JOURNAL OF HAZARDOUS MATERIALS》 (危险物资杂志)

年 卷 期：2024年第473卷

页      面：134630页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：National Natural Science Foundation of China 

主　　题：Decachlorobiphenyl Photoconversion Suspended particles Theoretical calculations Toxicity prediction 

摘      要：Decachlorobiphenyl (PCB-209) can be widely detected in suspended particles and sediments due to its large hydrophobicity, and some of its transformation products may potentially threaten organisms through the food chain. Here we investigate the photochemical transformation of PCB-209 on suspended particles from the Yellow River. It was found that the suspended particles had an obvious shielding effect to largely inhibit the photodegradation of PCB-209. Meanwhile, the presence of inorganic ions (e.g. Mg2+ and NO3- ) and organic matters (e. g. humic acid, HA) in the Yellow River water inhibited the reaction. The main transformation products of PCB209 were lower-chlorinated and hydroxylated polychlorinated biphenyls (OH-PCBs), and small amounts of pentachlorophenol (PCP) and polychlorinated dibenzofurans (PCDFs) were also observed. The mechanisms of PCP formation by double center dot OH attacking carbon bridge and PCDFs formation by elimination reaction of ionic state OH-PCBs were proposed using theoretical calculations, which provided some new insights into the intertransformations between persistent organic pollutants. In combination with VEGA and EPI Suite software, some intermediates such as PCDFs were more toxic to organisms than PCB-209. This study deepens the understanding of the transformation behavior of PCB-209 on suspended particles under sunlight.