title: Determination of polyoxymethylene (POM)--water partition coefficients for oxy-PAHs and PAHs.
abstract: Oxygenated polycyclic aromatic hydrocarbons (oxy-PAHs) are a class of ubiquitously occurring pollutants of which little is known. They can be co-emitted with PAHs or formed from PAHs in the environment. The environmental fate and risk of oxy-PAHs are difficult to assess due to a lack of methods to quantify their pore water concentrations. One sampler that can be used to determine freely dissolved concentrations of organic contaminants is polyoxymethylene (POM). In this study, POM - water partition coefficients (KPOM) were determined for 11 oxy-PAHs. KPOM values of 8 PAHs with similar hydrophobicities as the oxy-PAHs were determined for comparison. Results showed that logKPOM values ranged from 2.64 to 4.82 for the PAHs (2-4 rings), similar to previously determined values. LogKPOM values for investigated oxy-PAHs ranged from 0.96 to 5.36. The addition of carbonylic oxygen on a parent PAH generally lowered KPOM by 0.5 to 1.0 log units, which is attributable to the presence of carbonylic oxygens increasing water solubility. The KPOM values presented here will facilitate simultaneous assessments of freely dissolved water concentrations of oxy-PAHs and PAHs in environmental media.
authors.affiliation: Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, SE-75007 Uppsala, Sweden. Electronic address: sarah.josefsson@slu.se.
authors.forename: Sarah
authors.initials: S
authors.lastname: Josefsson
authors.affiliation: Norwegian Geotechnical Institute (NGI), P.O. Box 3930 Ullevål Stadion, N-0806 Oslo, Norway.
authors.forename: Hans Peter H
authors.initials: HPH
authors.lastname: Arp
authors.affiliation: Swedish Geotechnical Institute, SE-58193 Linköping, Sweden; Department of Soil and Environment, Swedish University of Agricultural Sciences, Box 7014, SE-75007 Uppsala, Sweden.
authors.forename: Dan Berggren
authors.initials: DB
authors.lastname: Kleja
authors.affiliation: Swedish Geotechnical Institute, SE-58193 Linköping, Sweden.
authors.forename: Anja
authors.initials: A
authors.lastname: Enell
authors.affiliation: Department of Chemistry, Umeå University, SE-90187 Umeå, Sweden.
authors.forename: Staffan
authors.initials: S
authors.lastname: Lundstedt
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D057230:Limit of Detection; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D012117:Resins, Synthetic / Q000032:analysis*; D012995:Solubility; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D012117:Resins, Synthetic; D014874:Water Pollutants, Chemical; C010102:delrin
keywords: Oxy-PAHs; PAHs; Passive samplers; Polyoxymethylene; Pore water concentrations