Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan, 571158, China.
Department of Marine Science and Convergence Engineering, College of Science and Convergence Technology, Hanyang University, Ansan, 15588, Republic of Korea.
Chemosphere. 2024 Feb;349:140779. doi: 10.1016/j.chemosphere.2023.140779. Epub 2023 Nov 24.
Siloxanes have been commonly used as additives in a variety of industrial and consumer products. Media and government investigations have revealed that defoamers containing siloxanes are used in the effluent of thermal power plants in Korea. However, investigations of the source impact of siloxane contamination from the discharge of thermal power plants into coastal environments are scarce. In this study, sediment and invertebrates were collected around a thermal power plant to assess source impact, seasonal variation, and a potential for bioaccumulation. Although siloxanes were detectable in sediment and invertebrates, the spatial distribution and composition (which differed between the siloxanes found in sediment and invertebrates and those in defoamer used in the plant) suggest they were likely transported by long-distance migration as well as the discharge of thermal power plant. Seasonal differences might affect sedimentary contamination and the bioaccumulation potential of siloxanes. Specifically, octamethylcyclotetrasiloxane (D4) may have limited adsorption capacity and potential for long-distance migration, as its contribution in sediment far from the coastline was greater than that of decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexasiloxane (D6). However, higher D5 accumulation in invertebrates, and D5 has a potential bioaccumulation. A molecular docking analysis showed that the binding affinity between D5 and the cytochrome enzyme in invertebrates was weaker than that with other siloxanes, which could lead to higher D5 accumulation in invertebrates.
硅氧烷已被广泛用作各种工业和消费品的添加剂。媒体和政府的调查显示，韩国火力发电厂的废水中使用了含有硅氧烷的消泡剂。然而，关于火力发电厂排放的硅氧烷污染对沿海环境的源影响的调查却很少。本研究采集了火力发电厂周围的沉积物和无脊椎动物，以评估源影响、季节性变化以及生物累积的潜力。尽管硅氧烷在沉积物和无脊椎动物中均可被检测到，但空间分布和组成（与工厂中使用的消泡剂中的硅氧烷不同）表明，它们可能是通过远距离迁移以及火力发电厂的排放而被输送的。季节性差异可能会影响硅氧烷的沉积污染和生物累积潜力。具体而言，八甲基环四硅氧烷（D4）可能由于吸附能力有限和远距离迁移潜力有限，其在远离海岸线的沉积物中的贡献大于十甲基环五硅氧烷（D5）和十二甲基环己硅氧烷（D6）。然而，D5 在无脊椎动物中的积累更高，并且 D5 具有潜在的生物累积性。分子对接分析表明，D5 与无脊椎动物细胞色素酶的结合亲和力弱于与其他硅氧烷的结合亲和力，这可能导致无脊椎动物中 D5 的积累更高。
