Oregon State University, Department of Environmental and Molecular Toxicology, 1007 Agriculture & Life Sciences Building, Corvallis, OR 97331, USA.
Environ Pollut. 2014 Oct;193:71-78. doi: 10.1016/j.envpol.2014.06.019. Epub 2014 Jul 7.
Sequestering semi-polar compounds can be difficult with low-density polyethylene (LDPE), but those pollutants may be more efficiently absorbed using silicone. In this work, optimized methods for cleaning, infusing reference standards, and polymer extraction are reported along with field comparisons of several silicone materials for polycyclic aromatic hydrocarbons (PAHs) and pesticides. In a final field demonstration, the most optimal silicone material is coupled with LDPE in a large-scale study to examine PAHs in addition to oxygenated-PAHs (OPAHs) at a Superfund site. OPAHs exemplify a sensitive range of chemical properties to compare polymers (log Kow 0.2-5.3), and transformation products of commonly studied parent PAHs. On average, while polymer concentrations differed nearly 7-fold, water-calculated values were more similar (about 3.5-fold or less) for both PAHs (17) and OPAHs (7). Individual water concentrations of OPAHs differed dramatically between silicone and LDPE, highlighting the advantages of choosing appropriate polymers and optimized methods for pollutant monitoring.
用低密度聚乙烯 (LDPE) 对部分非极性化合物进行隔离可能较为困难，但使用硅酮可以更有效地吸收这些污染物。在这项工作中，报告了优化的清洁、注入参比标准和聚合物提取方法，并对几种用于多环芳烃 (PAHs) 和农药的硅酮材料进行了现场比较。在最后的现场演示中，最优化的硅酮材料与 LDPE 结合，在一个大型研究中对超级基金站点中的 PAHs 以及含氧多环芳烃 (OPAHs) 进行了研究。OPAHs 是一类对聚合物（log Kow 0.2-5.3）和通常研究的母体 PAHs 的转化产物具有灵敏化学性质范围的物质。平均而言，尽管聚合物浓度相差近 7 倍，但水计算值对于 PAHs（17 种）和 OPAHs（7 种）更为相似（约 3.5 倍或更小）。硅酮和 LDPE 之间 OPAHs 的个别水浓度差异很大，这突出了选择合适的聚合物和优化的污染物监测方法的优势。
