Print Email Facebook Twitter Partitioning of hydrophobic organic contaminants between polymer and lipids for two silicones and low density polyethylene Title Partitioning of hydrophobic organic contaminants between polymer and lipids for two silicones and low density polyethylene Author Smedes, F. Rusina, T.P. Beeltje, H. Mayer, P. Publication year 2017 Abstract 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) that KPL was 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 obtained KPL can 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. © 2017 Subject Urban Mobility & EnvironmentEMS - Environmental Modelling, Sensing & AnalysisELSS - Earth, Life and Social SciencesEnvironment & SustainabilityEnvironmentUrbanisationDiffusion coefficientLipidMicroplasticPartition coefficientPassive sampling To reference this document use: http://resolver.tudelft.nl/uuid:02090c72-ba31-4b88-a5ce-1f9ef4f664f1 DOI https://doi.org/10.1016/j.chemosphere.2017.08.044 TNO identifier 780733 ISSN 0045-6535 Source Chemosphere, 186, 948-957 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.