title: Bioavailability of organochlorine compounds in aqueous suspensions of fullerene: evaluated with medaka (Oryzias latipes) and negligible depletion solid-phase microextraction.
abstract: The wide application of engineered nanomaterials, such as fullerene (C(60)), will inevitably lead to their release into the aqueous environment, which may alter the bioavailability of organic compounds to aquatic organisms. Negligible depletion solid-phase microextraction (nd-SPME) together with medaka (Oryzias latipes) bioaccumulation were used to study the effects of aqueous suspensions of fullerene (nC(60)) on the bioavailability of eight organochlorine compounds (OCCs) (logK(OW) 3.76-6.96). Freely dissolved concentrations of OCCs decreased by 11.5-88.4% at addition of 5mgL(-1)nC(60) as indicated by reduced equilibrium concentrations in the SPME fiber coating, the highest reduction being observed for the most hydrophobic OCCs. Medaka bioaccumulation study demonstrated that at the kinetic uptake regime, nC(60) significantly decreased the bioaccumulation of the high hydrophobic OCCs (logK(OW)>6), but slightly enhanced the bioaccumulation of the less hydrophobic OCCs (logK(OW)<6). The OCC concentrations in medaka (C(fish)) at the kinetic uptake regime linearly correlated with that in nd-SPME fiber (C(fiber)) without nC(60) (p=0.007-0.013, R(2)=0.666-0.723), but this correlation deteriorated with the presence of nC(60) (p=0.073-0.081, R(2)=0.423-0.440). These results suggest that in nC(60) the uptake mechanism of OCCs to medaka is different from that to nd-SPME fiber. While only the freely dissolved OCCs are available to nd-SPME fiber, both the freely dissolved and the nC(60) associated OCCs contributed to the accumulation of OCCs to medaka.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085 Beijing, China.
authors.forename: Xialin
authors.initials: X
authors.lastname: Hu
authors.forename: Jingfu
authors.initials: J
authors.lastname: Liu
authors.forename: Qunfang
authors.initials: Q
authors.lastname: Zhou
authors.forename: Shiyan
authors.initials: S
authors.lastname: Lu
authors.forename: Rui
authors.initials: R
authors.lastname: Liu
authors.forename: Lin
authors.initials: L
authors.lastname: Cui
authors.forename: Daqiang
authors.initials: D
authors.lastname: Yin
authors.forename: Philipp
authors.initials: P
authors.lastname: Mayer
authors.forename: Guibin
authors.initials: G
authors.lastname: Jiang
mesh_terms: D000818:Animals; D037741:Fullerenes / Q000737:chemistry / Q000378:metabolism*; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D057927:Hydrophobic and Hydrophilic Interactions; D009990:Oryzias / Q000378:metabolism*; D052617:Solid Phase Microextraction; D013535:Suspensions; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D037741:Fullerenes; D006843:Hydrocarbons, Chlorinated; D013535:Suspensions; D014874:Water Pollutants, Chemical