Partitioning of hydrophobic organic contaminants between polymer and lipids for two silicones and low density polyethylene.
Partitioning of hydrophobic organic contaminants between polymer and lipids for two silicones and low density polyethylene.
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DOI：
10.1016/j.chemosphere.2017.08.044
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发表时间：
2017-11
期刊：
影响因子：
8.8
通讯作者：
F. Smedes;Tatsiana P. Rusina;Henry Beeltje;P. Mayer
中科院分区：
文献类型：
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作者：
F. Smedes;Tatsiana P. Rusina;Henry Beeltje;P. Mayer
聚合物越来越多地用于环境介质（包括水、空气、土壤、沉积物甚至生物组织）中的中性疏水性有机物质（HOC）的被动采样。可以测量HOC在聚合物中的平衡浓度，然后将其转化为在其他（限定的）介质中的平衡浓度，然而这需要适当的聚合物对介质的分配系数。因此，我们通过在4 °C和20 °C下用鱼油和三油酸甘油酯平衡两种有机硅和低密度聚乙烯（LDPE），测定了各种PCB、PAH和有机氯农药的聚合物-脂质分配系数（KPL）。我们观察到（i）KPL在很大程度上与脂质类型和温度无关，（ii）聚合物中的脂质扩散速率高于基于其分子体积的预测，（iii）与LDPE相比，硅酮显示出更高的脂质扩散和更低的脂质吸附，（iv）吸收的脂质表现得像共溶质，至少对于较小分子尺寸的HOC，不会影响HOC的分配。所得到的KPL可将被动采样聚合物中测得的平衡浓度转换为脂质中的平衡浓度，然后可用于（1）环境质量监测和评估，（2）热力学暴露评估和（3）评估被动采样与生物群中传统测量的脂质标准化浓度之间的联系。LDPE-脂质分配系数也可用于微塑料中所含HOC的生物学合理风险评估。
Polymers are increasingly used for passive sampling of neutral hydrophobic organic substances (HOC) in environmental media including water, air, soil, sediment and even biological tissue. The equilibrium concentration of HOC in the polymer can be measured and then converted into equilibrium concentrations in other (defined) media, which however requires appropriate polymer to media partition coefficients. We determined thus polymer-lipid partition coefficients (KPL) of various PCB, PAH and organochlorine pesticides by equilibration of two silicones and low density polyethylene (LDPE) with fish oil and Triolein at 4 °C and 20 °C. We observed (i) thatKPLwas largely independent of lipid type and temperature, (ii) that lipid diffusion rates in the polymers were higher compared to predictions based on their molecular volume, (iii) that silicones showed higher lipid diffusion and lower lipid sorption compared to LDPE and (iv) that absorbed lipid behaved like a co-solute and did not affect the partitioning of HOC at least for the smaller molecular size HOC. The obtainedKPLcan convert measured equilibrium concentrations in passive sampling polymers into equilibrium concentrations in lipid, which then can be used (1) for environmental quality monitoring and assessment, (2) for thermodynamic exposure assessment and (3) for assessing the linkage between passive sampling and the traditionally measured lipid-normalized concentrations in biota. LDPE-lipid partition coefficients may also be of use for a thermodynamically sound risk assessment of HOC contained in microplastics.