title: Mobility of polyaromatic hydrocarbons (PAHs) in soil in the presence of carbon nanotubes.
abstract: Being a potential risk to the environment, a fate study of carbon nanotube (CNT) in the environment is urgently needed. A study of CNT impacts on the bioavailability of other conventional contaminants in a terrestrial system is particularly rare. This study explored PAH leaching behaviors in the presence of CNTs with column leaching tests. Four PAHs (Naphthalene, fluorene, phenanthrene, and pyrene), three CNTs (f-SWNTs, MWNTs, f-MWNTs), and a sandy loam soil were involved in this study. We found that at a concentration of 5mg/g, CNTs could significantly retain PAHs in soil. Such a strong PAH retention was caused by low mobilities of CNTs and their strong PAH sorption capacities. This study illustrated that the properties of both sorbents (e.g. available surface area and micropore volume) and sorbates (e.g. hydrophobicity and molecular volume) influenced the mobility 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: Uday
authors.initials: U
authors.lastname: Turaga
authors.forename: Babina
authors.initials: B
authors.lastname: Shrestha
authors.forename: Todd A
authors.initials: TA
authors.lastname: Anderson
authors.forename: S S
authors.initials: SS
authors.lastname: Ramkumar
authors.forename: Micah J
authors.initials: MJ
authors.lastname: Green
authors.forename: Sriya
authors.initials: S
authors.lastname: Das
authors.forename: Jaclyn E
authors.initials: JE
authors.lastname: Cañas-Carrell
mesh_terms: D004784:Environmental Monitoring; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D012989:Soil Pollutants
keywords: Bioavailability; CNTs; MWNTs; PAH leaching; SWNTs; Soil