State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China.
J Environ Sci (China). 2019 Feb;76:199-207. doi: 10.1016/j.jes.2018.04.026. Epub 2018 May 1.
Methylsiloxanes are a class of silicone compounds that have been widely used in various industrial processes and personal care products for several decades. This study investigated the spatial distribution of three cyclic methylsiloxanes (D4-D6) and twelve linear methylsiloxanes (L5-L16) in mollusks collected from seven cities along the Bohai Sea. D4-D6 (df = 71%-81%) and L8-L16 (df = 32%-40%) were frequently detectable in the mollusk samples, while L5-L7 were not found in any mollusk samples. Cyclic methylsiloxanes (D4-D6) were found in mollusks with the mean concentrations of 15.7 ± 12.3 ng/g ww for D4, 24.6 ± 15.8 ng/g ww for D5 and 34.0 ± 23.0 ng/g ww for D6. Among the seven sampling cities, the cyclic methylsiloxanes were predominant in mollusks, with the total cyclic methylsiloxanes (sum of D4-D6, ∑CMS) accounting for 74.2%-80.7% of the total methylsiloxanes. ∑CMS along the coastline demonstrated a clear gradient, with the highest concentrations in mollusks at the sampling sites located in the western part of the Bohai Sea and the lowest concentrations in mollusks from cities located in the eastern part of the Bohai Sea. The biota-sediment accumulation factors for cyclic methylsiloxanes (D4-D6) and linear methylsiloxanes (L8-L16) were estimated as 0.42 ± 0.06-0.53 ± 0.06 and 0.13 ± 0.03-0.19 ± 0.05, respectively.
环状甲基硅氧烷（D4-D6）和 12 种线性甲基硅氧烷（L5-L16）在渤海沿岸 7 个城市的贝类中的空间分布。D4-D6（df=71%-81%）和 L8-L16（df=32%-40%）在贝类样本中经常被检测到，而 L5-L7 则在任何贝类样本中都未被发现。在贝类中发现了环状甲基硅氧烷（D4-D6），其平均浓度分别为 15.7±12.3ng/g ww 的 D4、24.6±15.8ng/g ww 的 D5 和 34.0±23.0ng/g ww 的 D6。在这 7 个采样城市中，环状甲基硅氧烷在贝类中占主导地位，总环状甲基硅氧烷（D4-D6 之和，∑CMS）占总甲基硅氧烷的 74.2%-80.7%。沿渤海湾的∑CMS 表现出明显的梯度，在位于渤海西部的采样点的贝类中浓度最高，而在位于渤海东部的城市的贝类中浓度最低。环状甲基硅氧烷（D4-D6）和线性甲基硅氧烷（L8-L16）的生物沉积物积累因子估计为 0.42±0.06-0.53±0.06 和 0.13±0.03-0.19±0.05。
