Bioaccumulation and Biotransformation of Triclosan and Galaxolide in the Freshwater Oligochaete Limnodrilus hoffmeisteri in a Water/Sediment Microcosm,Environmental Science & Technology

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Bioaccumulation and Biotransformation of Triclosan and Galaxolide in the Freshwater Oligochaete Limnodrilus hoffmeisteri in a Water/Sediment Microcosm
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-07-26 , DOI: 10.1021/acs.est.8b02637
Feng-Jiao Peng ₁ , Guang-Guo Ying ₂ , Chang-Gui Pan ₃ , Henriette Selck ₄ , Daniel Salvito ₅ , Paul J. Van den Brink _{1,

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Affiliation

Personal care products are widely used in our daily life in considerable quantities and discharged via the down-the-drain route to aquatic environments, resulting in potential risks to aquatic organisms. We investigated bioaccumulation and biotransformation of two widely used personal care products, triclosan (TCS) and galaxolide (HHCB) spiked to sediment, in the oligochaete worm Limnodrilus hoffmeisteri in water/sediment microcosms. After 7 days of sediment exposure to 3.1 μg of TCS or HHCB/g of dry weight sediment, the accumulation of TCS and HHCB in L. hoffmeisteri reached equilibrium, at which point the biota–sediment accumulation factors (BSAFs) were 2.07 and 2.50 for TCS and HHCB, respectively. The presence of L. hoffmeisteri significantly accelerated the dissipation of the levels of TCS and HHCB in the microcosms, with approximately 9.03 and 2.90% of TCS and HHCB, respectively, eliminated from the water/sediment systems after exposure for 14 days in the presence of worms. Two biotransformation products, methyl triclosan and triclosan O-sulfate, were identified for TCS in worm tissue, whereas only methyl triclosan was identified in the sediment. Unlike TCS, no evidence of biotransformation products was found for HHCB in either worm tissue or sediment. These experiments demonstrate that L. hoffmeisteri biotransformed TCS through methylation and sulfation, whereas HHCB biotransformation was undetectable.

中文翻译：

水/沉积物缩影中的三氯生和加拉索利特在淡水小Li鱼中的生物富集和生物转化

个人护理产品在我们的日常生活中被大量使用，并通过下水道排放到水生环境中，从而给水生生物带来潜在的风险。我们研究了在水/沉积物微观世界中的低聚蠕虫Limnodrilus hoffmeisteri中两种广泛使用的个人护理产品三氯生（TCS）和加拉索利德（HHCB）的生物富集和生物转化。在沉积物暴露于3.1μgTCS或HHCB / g干重沉积物中7天后，霍夫特氏乳杆菌中TCS和HHCB的积累达到平衡，此时的生物-沉积物积累因子（BSAFs）分别为2.07和2.50分别是TCS和HHCB。Hoffmeisteri的存在显着加速了微观世界中TCS和HHCB水平的消散，在蠕虫的存在下暴露14天后，分别从水/沉积物系统中消除了约9.03％和2.90％的TCS和HHCB。蠕虫组织中的TCS鉴定出了两种生物转化产物三氯生甲基和三氯生O-硫酸盐，而沉积物中仅发现了甲基三氯生。与TCS不同，在蠕虫组织或沉积物中均未发现HHCB具有生物转化产物的证据。这些实验证明霍夫麦斯特利氏菌通过甲基化和硫酸化生物转化了TCS，而HHCB生物转化是不可检测的。

更新日期：2018-07-26

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