本文研究了浙江省台州温桥地区以姆坑为中心的电子垃圾拆解区域55个土壤样品中甲基硅氧烷分布特征和迁移规律．结果表明，该地区土壤中15种目标物（D4—D6、L5—L16）均有检出，浓度范围为0．66—3．01×103 ng·g－1，检出率为1．82％—100％．该区域土壤样品中环形硅氧烷总浓度的中位值（23．1 ng·g－1）和线形硅氧烷总浓度的中位值（238 ng·g－1）分别比台州非电子垃圾拆解地土壤样品高3．5和16．7倍，说明电子垃圾拆解可能是该区域土壤中甲基硅氧烷的重要来源．结合实际样品监测与室内模拟发现，一方面，由于挥发性较弱，线形甲基硅氧烷由污染源向周围土壤中迁移的能力弱于环形甲基硅氧烷；另一方面，由于较弱的挥发性和降解性，线形硅氧烷在污染源土壤中的持久性要强于环形硅氧烷．
Distribution and migration of methyl siloxanes in 55 soil samples from a typical e?waste dismantling area ( Wenqiao′center Mukeng ) in Taizhou City, Zhejiang Province were studied. Within the area, 15 target compounds ( D4—D6, L5—L16) in these soil samples were detected, with concentrations ranging from 0.66—3.01×103 ng·g-1(detection frequencies=1.82%—100%). In these samples, the median values of total cyclic methyl siloxanes concentrations (ΣD4—D6) and total linear methyl siloxanes concentrations (ΣL4—L16) were 23.1 ng·g-1 and 238 ng·g-1 , which were 3.5 and 16. 7 times higher than those in the reference soil samples, respectively. The results showed that e?waste dismantling might release methyl siloxanes to soil in this region. Combining the actual sample monitoring with elimination experiments, our research found that due to lower volatility, the migration of linear methyl siloxanes from the pollution source to the surrounding soil was weaker than cyclic methyl siloxanes. However, with lower volatility and poorer degradability, linear siloxane in soil would persist for longer time than cyclic methyl siloxanes.
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