Dow Corning Corporation, Health and Environmental Sciences, Auburn, Michigan 48686, United States.
Environ Sci Technol. 2014 Oct 21;48(20):11748-59. doi: 10.1021/es503465b. Epub 2014 Oct 7.
Volatile methylsiloxanes (VMS) enter the environment through industrial activities and the use of various consumer products. Reliable measurements of environmental partition properties for these compounds are critical for accurate prediction of their environmental fate, distribution, transport, exposure and potential effects. In this study, the measured partition properties including air/water (K(AW)), octanol/water (K(OW)), and octanol/air partitioning coefficients (K(OA)), soil organic carbon/water distribution coefficient (K(OC)), and biological medium/fluid partition coefficients, and their temperature dependence were critically reviewed. Based on these results, organosilicon compounds such as methylsiloxanes are expected to behave differently in the environment compared to conventional hydrophobic environmental contaminants, as a result of their inherent characteristics related to molecular size and capacity for different types of molecular interactions that control partitioning. The differences are critical and need to be taken into consideration in environmental exposure and risk analyses of these compounds.
挥发性甲基硅氧烷（VMS）通过工业活动和各种消费产品进入环境。这些化合物环境分配特性的可靠测量对于准确预测其环境命运、分布、迁移、暴露和潜在影响至关重要。在这项研究中，对包括空气/水（K(AW)）、辛醇/水（K(OW)）和辛醇/空气分配系数（K(OA））、土壤有机碳/水分配系数（K(OC)）以及生物介质/流体分配系数在内的分配特性及其温度依赖性进行了严格审查。基于这些结果，预计有机硅化合物（如甲基硅氧烷）在环境中的行为将与传统疏水性环境污染物不同，这是由于它们与分子大小和控制分配的不同类型分子相互作用能力相关的固有特性所致。这些差异非常关键，在这些化合物的环境暴露和风险分析中需要加以考虑。
