title: Comparative studies of multi-walled carbon nanotubes (MWNTs) and octadecyl (C18) as sorbents in passive sampling devices for biomimetic uptake of polycyclic aromatic hydrocarbons (PAHs) from soils.
abstract: To avoid overestimating the risk of polycyclic aromatic hydrocarbons (PAHs), research is needed to evaluate the bioavailable portion of PAHs in the environment. However, limited PSDs were developed for a terrestrial soil system. In this study, two sorbents, octadecyl (C18) and multi-walled carbon nanotubes (MWNTs), were individually evaluated as sorbents in passive sampling devices (PSDs) as biomimetic samplers to assess the uptake of PAHs from soil. C18-PSDs were an excellent biomimetic tool for PAHs with a low molecular weight in complex exposure conditions with different soil types, types of PAHs, aging periods, and initial PAH concentrations in soil. The utility of MWNT-PSDs was limited by extraction efficiencies of PAHs from MWNTs. However, when compared to C18-PSDs, they had higher adsorption capacities and were less expensive. This study provides data regarding useful techniques that can be used in risk assessment to assess the bioavailability of PAHs in soil.
authors.affiliation: Department of Environmental Toxicology, The Institute of Environmental and Human Health (TIEHH), Texas Tech University, Box 41163, Lubbock, TX 79409-1163, USA. li.shibin@epa.gov
authors.forename: Shibin
authors.initials: S
authors.lastname: Li
authors.forename: Todd A
authors.initials: TA
authors.lastname: Anderson
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Maul
authors.forename: Babina
authors.initials: B
authors.lastname: Shrestha
authors.forename: Micah J
authors.initials: MJ
authors.lastname: Green
authors.forename: Jaclyn E
authors.initials: JE
authors.lastname: Cañas-Carrell
mesh_terms: D000327:Adsorption; D000818:Animals; D001682:Biological Availability; D032701:Biomimetics; D015394:Molecular Structure; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009835:Oligochaeta / Q000378:metabolism*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000493:pharmacokinetics*; D012989:Soil Pollutants / Q000737:chemistry*; D013048:Specimen Handling / Q000379:methods
chemical_list: D037742:Nanotubes, Carbon; D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants
keywords: Bioavailability; C(18); Earthworms; MWNTs; PAHs; Passive sampling devices