State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environment and Resources, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China.
University of the Chinese Academy of Sciences, Beijing, China.
Environ Sci Pollut Res Int. 2018 Sep;25(27):27013-27020. doi: 10.1007/s11356-018-2743-2. Epub 2018 Jul 16.
Air samples were collected from 26 air-monitoring stations located in the Pearl River Delta (PRD) and two in Shaoguan, South China, to investigate the spatial distribution and temporal changes in polybrominated diphenyl ethers (PBDEs) after the production and use of PBDE commercial formulations was restricted in China and the "dual transfer strategy" implemented by Guangdong Province. The spatial distribution of PBDEs was inhomogeneous in the PRD region, with concentrations ranging from 26.3 to 634 pg/m and a mean value of 105 pg/m. The PBDE levels in the five western cities (Guangzhou, Foshan, Zhaoqing, Zhongshan, and Jiangmen) were markedly higher than those in the four eastern cities (Dongguan, Huizhou, Shenzhen, and Zhuhai). BDE-209 was the predominant congener, accounting for 57.3-89.8% of the total measured PBDEs in this study. The proportion of penta- and nona-BDE congeners in the four eastern cities was markedly higher than those in five western cities. Principal component analysis showed that this elevation might be related to the debromination of BDE-209 during the thermal treatment process of products when PBDEs are used as flame retardants. Although the PBDE levels found in this study were markedly lower than those reported in previous studies, further efforts are still needed to clarify if there was a decreasing trend for PBDEs in the atmosphere of the PRD, in view of the increasing trends of PBDEs found by other researchers in mangrove sediments from Hong Kong and the Pearl River estuary in 2014 and 2015.
采集了中国华南地区珠江三角洲（PRD）的 26 个空气监测站和韶关市的 2 个空气监测站的空气样本，以调查在中国限制 PBDE 商用配方的生产和使用以及广东省实施“双转移”战略后，多溴二苯醚（PBDE）的空间分布和时间变化。PRD 地区 PBDE 的空间分布不均匀，浓度范围为 26.3 至 634 pg/m，平均值为 105 pg/m。位于西部的五个城市（广州、佛山、肇庆、中山和江门）的 PBDE 水平明显高于位于东部的四个城市（东莞、惠州、深圳和珠海）。BDE-209 是主要的同系物，占本研究中总测量 PBDE 的 57.3-89.8%。四个东部城市的五溴和九溴同系物的比例明显高于五个西部城市。主成分分析表明，这种升高可能与 PBDE 作为阻燃剂在产品的热处理过程中 BDE-209 的脱溴有关。尽管本研究中发现的 PBDE 水平明显低于以前研究报告的水平，但鉴于其他研究人员在 2014 年和 2015 年在香港和珠江口红树林沉积物中发现的 PBDE 呈上升趋势，仍需要进一步努力阐明 PRD 大气中 PBDE 是否呈下降趋势。
