title: Particle phase distribution of polycyclic aromatic hydrocarbons in stormwater--Using humic acid and iron nano-sized colloids as test particles.
abstract: The distribution of polycyclic aromatic hydrocarbons (PAHs) in different particulate fractions in stormwater: Total, Particulate, Filtrated, Colloidal and Dissolved fractions, were examined and compared to synthetic suspensions of humic acid colloids and iron nano-sized particles. The distribution of low-molecular weight PAHs (LMW PAHs), middle-molecular weight PAHs (MMW PAHs) and high-molecular weight PAHs (HMW PAHs) among the fractions was also evaluated. The results from the synthetic suspensions showed that the highest concentrations of the PAHs were found in the Filtrated fractions and, surprisingly, high loads were found in the Dissolved fractions. The PAHs identified in stormwater in the Particulate fractions and Dissolved fractions follow their hydrophobic properties. In most samples >50% of the HMW PAHs were found in the Particulate fractions, while the LMW and MMW PAHs were found to a higher extent in the Filtrated fractions. The highest concentrations of PAHs were present in the stormwater with the highest total suspended solids (TSS); the relative amount of the HMW PAHs was highest in the Particulate fractions (particles>0.7 μm). The highest concentration of PAHs in the Colloidal fraction was found in the sample with occurrence of small nano-sized particles (<10nm). The results show the importance of developing technologies that both can manage particulate matter and effectively remove PAHs present in the Colloidal and Dissolved fractions in stormwater.
authors.affiliation: Department of Environmental Engineering, Technical University of Denmark, Miljoevej B115, DK 2800 Kgs. Lyngby, Denmark. Electronic address: katni@env.dtu.dk.
authors.forename: Katrine
authors.initials: K
authors.lastname: Nielsen
authors.affiliation: Department of Civil and Environmental Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden. Electronic address: yuliya.kalmykova@chalmers.se.
authors.forename: Yuliya
authors.initials: Y
authors.lastname: Kalmykova
authors.affiliation: Department of Civil and Environmental Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden. Electronic address: ann-margret.stromvall@chalmers.se.
authors.forename: Ann-Margret
authors.initials: AM
authors.lastname: Strömvall
authors.affiliation: Department of Environmental Engineering, Technical University of Denmark, Miljoevej B115, DK 2800 Kgs. Lyngby, Denmark. Electronic address: abau@env.dtu.dk.
authors.forename: Anders
authors.initials: A
authors.lastname: Baun
authors.affiliation: Department of Environmental Engineering, Technical University of Denmark, Miljoevej B115, DK 2800 Kgs. Lyngby, Denmark. Electronic address: evek@env.dtu.dk.
authors.forename: Eva
authors.initials: E
authors.lastname: Eriksson
mesh_terms: D003102:Colloids / Q000737:chemistry; D004784:Environmental Monitoring; D006812:Humic Substances; D007501:Iron / Q000737:chemistry; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D003102:Colloids; D006812:Humic Substances; D007501:Iron; D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Colloid enhanced transport; Liquid–liquid extraction; Particle sorption; Solid phase extraction; Urban stormwater