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Distribution and adsorption-desorption of organophosphate esters from land to sea in the sediments of the Beibu Gulf, South China Sea: Impact of seagoing river input
Science of the Total Environment ( IF 8.2 ) Pub Date : 2024-01-26 , DOI: 10.1016/j.scitotenv.2024.170359 Fang Liu 1 , Ruijie Zhang 2 , Haolan Li 1 , Huanxin Liu 3 , Annan Yan 3 , Minwei Han 3 , Yaru Kang 3 , Zheng-En Zhang 4 , Yinghui Wang 3 , Kefu Yu 2
Science of the Total Environment ( IF 8.2 ) Pub Date : 2024-01-26 , DOI: 10.1016/j.scitotenv.2024.170359 Fang Liu 1 , Ruijie Zhang 2 , Haolan Li 1 , Huanxin Liu 3 , Annan Yan 3 , Minwei Han 3 , Yaru Kang 3 , Zheng-En Zhang 4 , Yinghui Wang 3 , Kefu Yu 2
Affiliation
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Organophosphate esters (OPEs) have been a class of emerging environmental contaminants. However, studies on their environmental behavior, specifically their adsorption-desorption behavior between sediment and seawater in estuarine and coastal areas, remain limited. To address this gap, our study focused on investigating the levels and behavior of 11 OPEs in sediment samples collected from the Beibu Gulf, South China Sea, encompassing estuaries and coastal regions. The total concentrations of 11 OPEs (Σ11 OPEs) in the sediments exhibit a significant decrease in summer, both in seagoing rivers (4.67 ± 2.74 ng/g dw) and the coastal zone (5.11 ± 3.71 ng/g dw), compared to winter levels in seagoing rivers (8.26 ± 4.70 ng/g dw) and the coastal zone (7.71 ± 3.83 ng/g dw). Chlorinated OPEs dominated the sediments, constituting 63 %–76 % of the total. Particularly, port and mariculture areas showed the highest levels of OPEs. Through load estimation analysis, it was revealed that the sedimentary OPEs in Qinzhou Bay (221 ± 128 kg) had the highest load, with input from the Qin River identified as a significant source. Chlorinated OPEs showed a trend of desorption from sediments to the water column with increasing salinity, emphasizing the crucial role of land-based OPEs input through suspended particulate matter in rivers as a pathway to the ocean. The impact of strong flow in estuarine environments was highlighted, as it can scour sediments, generate suspended sediments, and release OPEs into the water bodies. Additionally, the results of the ecological risk assessment indicated that most of the OPEs posed low-risk levels. However, attention is warranted for the contamination levels of some chlorinated OPEs, emphasizing the need for ongoing monitoring and assessment.
中文翻译：
南海北部湾沉积物中有机磷酸酯由陆向海的分布及吸附-脱附：远洋河流输入的影响
有机磷酸酯 （OPE） 是一类新兴的环境污染物。然而，对它们的环境行为的研究，特别是它们在河口和沿海地区沉积物和海水之间的吸附-解吸行为，仍然有限。为了解决这一差距，我们的研究重点是调查从南海北部湾（包括河口和沿海地区）收集的沉积物样本中 11 种 OPE 的水平和行为。与沿海河流（8.26 ±至 4.70 ng/g dw）和沿海地区（7.71 ± 3.83 ng/g dw）相比，沉积物中 11 种 OPE （Σ11OPE） 的总浓度在夏季表现出显着下降，无论是远洋河流（4.67 ± 2.74 ng/g dw）± 3.71 ng/g dw）。氯化 OPE 在沉积物中占主导地位，占总量的 63 %–76 %。特别是，港口和海水养殖区的 OPE 水平最高。通过载荷估计分析表明，钦州湾沉积 OPE（221 ± 128 kg）的载荷最高，其中来自秦江的输入是重要来源。随着盐度的增加，氯化 OPE 显示出从沉积物解吸到水柱的趋势，强调了通过河流中悬浮颗粒物输入的陆基 OPE 作为通往海洋的途径的关键作用。强调了河口环境中强流的影响，因为它可以冲刷沉积物，产生悬浮沉积物，并将 OPE 释放到水体中。此外，生态风险评估结果表明，大多数 OPE 处于低风险水平。然而，需要注意一些氯化 OPE 的污染水平，强调需要持续监测和评估。
更新日期：2024-01-26
中文翻译：
南海北部湾沉积物中有机磷酸酯由陆向海的分布及吸附-脱附：远洋河流输入的影响
有机磷酸酯 （OPE） 是一类新兴的环境污染物。然而，对它们的环境行为的研究，特别是它们在河口和沿海地区沉积物和海水之间的吸附-解吸行为，仍然有限。为了解决这一差距，我们的研究重点是调查从南海北部湾（包括河口和沿海地区）收集的沉积物样本中 11 种 OPE 的水平和行为。与沿海河流（8.26 ±至 4.70 ng/g dw）和沿海地区（7.71 ± 3.83 ng/g dw）相比，沉积物中 11 种 OPE （Σ11OPE） 的总浓度在夏季表现出显着下降，无论是远洋河流（4.67 ± 2.74 ng/g dw）± 3.71 ng/g dw）。氯化 OPE 在沉积物中占主导地位，占总量的 63 %–76 %。特别是，港口和海水养殖区的 OPE 水平最高。通过载荷估计分析表明，钦州湾沉积 OPE（221 ± 128 kg）的载荷最高，其中来自秦江的输入是重要来源。随着盐度的增加，氯化 OPE 显示出从沉积物解吸到水柱的趋势，强调了通过河流中悬浮颗粒物输入的陆基 OPE 作为通往海洋的途径的关键作用。强调了河口环境中强流的影响，因为它可以冲刷沉积物，产生悬浮沉积物，并将 OPE 释放到水体中。此外，生态风险评估结果表明，大多数 OPE 处于低风险水平。然而，需要注意一些氯化 OPE 的污染水平，强调需要持续监测和评估。
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