Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, China.
College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China.
Environ Pollut. 2019 Jul;250:695-707. doi: 10.1016/j.envpol.2019.04.107. Epub 2019 Apr 23.
In this study, nine congeners of polybrominated diphenyl ethers (PBDEs) and sixteen congeners of polycyclic aromatic hydrocarbons (PAHs) were measured in water samples to elucidate their spatial distribution, congener profiles, sources and ecological risks in the Guanlan River during both the dry season (DS) and the wet season (WS). The concentration of ΣPBDE ranged from 58.40 to 186.35 ng/L with an average of 115.72 ng/L in the DS, and from 8.20 to 37.80 ng/L with an average of 22.15 ng/L in the WS. Meanwhile, the concentration of ΣPAHs was ranged from 121.80 to 8371.70 ng/L with an average of 3271.18 ng/L in the DS and from 1.85 to 7124.25 ng/L with an average of 908.11 ng/L in the WS. The concentrations of PBDEs and PAHs in the DS were significantly higher than those in the WS, probably due to the dilution of the river during the rainy season. Moreover, the spatial distribution of pollutants revealed decreasing trend in the concentration from upstream to downstream and almost identical pattern was observed during both seasons. The source apportionment suggested that penta-BDE and to some extent octa-BDE commercial products were major sources of PBDEs in the study area. However, the sources of PAHs were mainly comprised of fossil fuels and biomass burning, followed by the petroleum products and their mixtures. The results of the ecological risk assessment indicated PBDEs contamination posed high ecological risks, while PAHs exhibited low or no ecological risks in the study area. Consistent with the environmental levels, the ecological risks of pollutants were relatively lower in the WS, compared to that in the DS. The results from this study would provide valuable baseline data and technical support for policy makers to protect the ecological environment of the Guanlan River.
在本研究中，测定了关澜河流域枯水期（DS）和丰水期（WS）水样中 9 种多溴二苯醚（PBDEs）和 16 种多环芳烃（PAHs）同系物的浓度，以阐明其空间分布、同系物特征、来源和生态风险。DS 中 ΣPBDE 的浓度范围为 58.40-186.35ng/L，平均值为 115.72ng/L；WS 中 ΣPBDE 的浓度范围为 8.20-37.80ng/L，平均值为 22.15ng/L。同时，DS 中 ΣPAHs 的浓度范围为 121.80-8371.70ng/L，平均值为 3271.18ng/L；WS 中 ΣPAHs 的浓度范围为 1.85-7124.25ng/L，平均值为 908.11ng/L。DS 中 PBDEs 和 PAHs 的浓度明显高于 WS，这可能是由于雨季河水稀释所致。此外，污染物的空间分布呈现出从上游到下游浓度逐渐降低的趋势，且在两个季节呈现出几乎相同的模式。来源分配表明，五溴和部分八溴商用产品是研究区域内 PBDEs 的主要来源。然而，PAHs 的来源主要包括化石燃料和生物质燃烧，其次是石油产品及其混合物。生态风险评估的结果表明，PBDEs 污染造成了高生态风险，而 PAHs 在研究区域内则表现出低或无生态风险。与环境水平一致，与 DS 相比，WS 中污染物的生态风险相对较低。本研究的结果将为决策者保护关澜河的生态环境提供有价值的基线数据和技术支持。
