National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing, 100050, China.
College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China.
Environ Sci Pollut Res Int. 2021 Apr;28(13):16054-16064. doi: 10.1007/s11356-020-11773-1. Epub 2020 Nov 27.
Methyl siloxanes are becoming increasingly prevalent in the environment because of their extensive use in various consumer products. Little is known about the distribution of these chemicals around factories or their presence in road dust. We conducted a survey of four cyclic (D-D) and 13 linear (L-L) siloxanes in road dusts around a manufacturing site and found a total siloxane concentration range of 47.3-3.16 × 10 ng/g (median 372). The predominant siloxanes in the road dust samples were D, D, D, and D, with median contributions of 65.3%, 17.9%, 6.36%, and 2.16% of the total siloxane concentrations, respectively. Our reported concentrations were comparable to those found in household dusts in previous studies. No high concentrations of siloxanes were observed in the road dust samples from the manufacturing site, which suggests that siloxanes in outdoor dusts are likely affected by many factors. Under a high exposure scenario, the daily intakes of total siloxanes via road dust ingestion at the 95th percentile were 2.13 and 0.313 ng/kg-bw/day for children and adults, respectively. Although the estimated exposure to siloxanes in outdoor dust for humans was low, more studies on the distributions and risks of siloxanes released from manufacturing sites are needed.
甲基硅氧烷由于在各种消费品中的广泛应用，在环境中变得越来越普遍。人们对这些化学物质在工厂周围的分布情况或其在道路尘埃中的存在情况知之甚少。我们对一个制造地点周围的道路尘埃中的四种环状（D-D）和 13 种线状（L-L）硅氧烷进行了调查，发现总硅氧烷浓度范围为 47.3-3.16×10 ng/g（中位数 372）。道路尘埃样品中主要的硅氧烷为 D、D、D 和 D，分别占总硅氧烷浓度的 65.3%、17.9%、6.36%和 2.16%。我们报告的浓度与先前研究中家庭尘埃中发现的浓度相当。在制造地点的道路尘埃样品中没有观察到硅氧烷的高浓度，这表明户外尘埃中的硅氧烷可能受到许多因素的影响。在高暴露情况下，通过摄入道路尘埃，儿童和成人每日摄入的总硅氧烷分别为 2.13 和 0.313ng/kg-bw/天，处于第 95 百分位。尽管人类从户外尘埃中接触硅氧烷的估计值较低，但仍需要更多研究制造地点释放的硅氧烷的分布和风险。
