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- W2901223522 abstract "TH029 Comparison of spiking and dialysis tubing methods for thedetermination of sorption capacity and plastic-water partitioncoefficient of three different polycyclic hydrocarbons onmicroplastics M. Gottschling, Y. Zhou, I. Schwabe, TechnischeUniversitaet Darmstadt / Institute IWAR Chair of Material FlowManagement and Resource Economy Germany; A. van Oyen, PlasticPartner GmbH; L. Schebek, Technische Universitaet Darmstadt /Institute IWAR Material Flow Management and Resource EconomyGermany; K. Sakaguchi-Soeder, Technische Universitaet Darmstadt /Institute IWAR Chair of Material Flow Management and ResourceEconomy Germany. Determination of sorption capacity of persistentorganic pollutants (POPs) on microplastics (MPs) is essential to studyecological effect of POPs-loaded MPs in the aqueous environment.However, due to high octanol-water partition coefficients (Kow) as wellas low water solubility, determination of sorption capacity of POPs onMPs in the laboratory is challenging. Here we present two methods todetermine plastic-water partition coefficient of three polycyclic aromatichydrocarbons (PAHs) on low-density polyethylene (LDPE):conventional spiking method and cellulose dialysis tubing method inbatch test in the laboratory. PAHs selected for this test were naphthalene(log Kow= 3.3 ), phenanthrene (log Kow= 4.46 ) and fluoranthene (logKow= 5.16 ). The plastic samples tested here are LDPE pellets with alow amount of additives. LDPE pellets were previously characterised byCARAT GmbH (Bocholt, Germany). For the spiking method, batchreactors containing given amount of LDPE and MilliQ water wereprepared. A high concentration of single PAHs in ethanol solution wasinjected into each batch reactor until the PAH concentration becamestable. PAH concentration in the batch was controlled using highperformance liquid chromatography (HPLC). For the dialysis tubingmethod, on the other hand, a closed dialysis tubing (permeability of12,000-14,000 Dalton) containing a given amount of LDPE and MilliQwater was placed in each batch reactor filled with MilliQ water withsingle PAHs far above solubility. The water concentration outside of thetubing was expected to stay constant (= water solubility) during theentire experiment. The PAH concentration in the dialysis tubing wascontrolled using HPLC until the PAH concentration became stable. Allbatch reactors were placed on a horizontal shaker. When the adsorptionof PAHs is completed, PAHs on LDPE are to be extracted andquantified using gas chromatography-mass spectrometry (GC/MS).Sorption capacity of each PAH was derived from the experiments andmethods were compared. PE-water partition coefficient of these PAHswere derived based on the sorption capacity using adsorption models.TU Darmstadt and CARAT are participants of an EU project„PLASTOX“, a consortium of a JPI Ocean’s Joint Action." @default.
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- W2901223522 date "2018-01-01" @default.
- W2901223522 modified "2023-09-26" @default.
- W2901223522 title "Comparison of spiking and dialysis tubing methods for the determination of sorption capacity and plastic-water partition coefficient of three different polycyclic hydrocarbons on microsplastic" @default.
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