College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
Int J Environ Res Public Health. 2022 Oct 25;19(21):13869. doi: 10.3390/ijerph192113869.
Methylsiloxanes (MSs), used in industrial production and personal care products, are released in various environmental media. In this study, we combined monitoring and modeling to investigate the occurrence and behavior of MSs in the urban environment in China. MSs were widely found in the air, water, soil and sediment of four cities in China. The concentrations of MSs in all four environmental media of Zhangjiagang were higher than those in the other three cities (Beijing, Kunming and Lijiang), indicating that the siloxane production plant had a significant impact on the pollution level of MSs in the surrounding environment. The samples with high MS concentrations were all from the sample sites near the outlet of the WWTPs, which showed that the effluent of the WWTPs was the main source of MS pollution in the surrounding environment. The modeling results of the EQC level III model showed that D4 discharged into the environment was mainly distributed in the air, while D5 and D6 were mainly distributed in the sediment. CMSs (D4-D6) discharged into various environmental media could exist in the urban environment for a long time with low temperatures in cities. When the temperature was 0 °C, the residence time of D5 and D6 could be 68.1 days and 243 days in the whole environmental system in Beijing. This study illustrates the importance of CMSs (D4-D6) in low-temperature environments and the potential environmental risks that they may pose.
甲基硅氧烷（MSs）广泛应用于工业生产和个人护理产品中，会释放到各种环境介质中。本研究结合监测与模拟，调查了 MSs 在我国城市环境中的分布情况和行为。研究发现 MSs 广泛存在于中国四个城市的空气、水、土壤和沉积物中。在所有四种环境介质中，张家港的 MSs 浓度均高于其他三个城市（北京、昆明和丽江），表明硅氧烷生产厂对周围环境中 MSs 污染水平有显著影响。高浓度 MSs 的样本均来自污水处理厂出口附近的采样点，表明污水处理厂的污水是周围环境中 MS 污染的主要来源。三级等效质量平衡模型（EQC）的模拟结果表明，D4 排入环境后主要分布在空气中，而 D5 和 D6 主要分布在沉积物中。排入各种环境介质中的 CMSs（D4-D6）在城市低温环境中可以长时间存在。在北京，当温度为 0°C 时，D5 和 D6 在整个环境系统中的停留时间分别为 68.1 天和 243 天。本研究说明了 CMSs（D4-D6）在低温环境中的重要性及其可能带来的潜在环境风险。
