College of Life and Environmental Science, Minzu University of China, Beijing 100081, China.
College of Life and Environmental Science, Minzu University of China, Beijing 100081, China; Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; Beijing Engineering Research Center of Food Environment and Public Health, Minzu University of China, Beijing 100081, China.
Sci Total Environ. 2022 Nov 10;846:157506. doi: 10.1016/j.scitotenv.2022.157506. Epub 2022 Jul 20.
Brominated polycyclic aromatic hydrocarbons (Br-PAHs) are an emerging class of persistent organic pollutants with toxicity similar to dioxins. Industrial thermal processes have been identified as major sources of Br-PAHs in the current environment. However, studies on soil contaminations with Br-PAHs around industrial areas were scarce. In this study, 18 Br-PAHs and 16 PAHs were analyzed in soils around an electronic waste dismantling area (EDA), an industrial area that mainly performed steel smelting (SSP), and an industrial area mainly performed secondary copper smelting (SCS). The mean concentrations of Br-PAHs and PAHs were 1362 pg/g and 1034 ng/g, 582 pg/g and 13,938 ng/g, and 307 pg/g and 2211 ng/g in the soil around EDA, SSP, and SCS, respectively. The order of Br-PAH concentrations among three industrial areas was inconsistent with that of PAHs, suggesting that there may be some differences in contamination characteristics of Br-PAHs in three types of industrial areas. The significant correlation between Br-PAHs and parent PAHs indicated that direct bromination may be the main formation pathway of Br-PAHs in soils in EDA. The result of principal component analysis further revealed that the congener pattern of Br-PAHs in soils around EDA is different from that of SSP and SCS. It was found that the ratio of 1-BrPyr and 3-BrFlu can be applied to identify environmental contamination with Br-PAHs from e-waste dismantling. The health risk assessment results showed that there were some soil samples with carcinogenic risks above the risk threshold in each industrial area, and deserve our concern.
溴代多环芳烃（Br-PAHs）是一类新兴的持久性有机污染物，其毒性与二恶英相似。工业热过程已被确定为当前环境中 Br-PAHs 的主要来源。然而，关于工业区域周围土壤中 Br-PAHs 污染的研究还很少。在这项研究中，分析了电子废物拆解区（EDA）、主要进行炼钢（SSP）的工业区域和主要进行二次铜冶炼（SCS）的工业区域周围土壤中的 18 种 Br-PAHs 和 16 种 PAHs。在 EDA、SSP 和 SCS 周围土壤中，Br-PAHs 和 PAHs 的平均浓度分别为 1362 pg/g 和 1034 ng/g、582 pg/g 和 13938 ng/g、307 pg/g 和 2211 ng/g。三种工业区域中 Br-PAHs 浓度的顺序与 PAHs 不一致，表明三种类型工业区域中 Br-PAHs 的污染特征可能存在差异。Br-PAHs 与母体 PAHs 之间的显著相关性表明，直接溴化可能是 EDA 土壤中 Br-PAHs 的主要形成途径。主成分分析的结果进一步表明，EDA 周围土壤中 Br-PAHs 的同系物模式与 SSP 和 SCS 不同。发现 1-BrPyr 和 3-BrFlu 的比值可用于识别来自电子废物拆解的 Br-PAHs 环境污染。健康风险评估结果表明，每个工业区域都有一些土壤样本的致癌风险超过了风险阈值，值得我们关注。
