title: Bioavailability of perfluorooctane sulfonate (PFOS) and  perfluorooctanoic acid (PFOA) in biosolids-amended soils to  earthworms (Eisenia fetida).
abstract: The bioavailability of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in seven biosolids-amended soils without any additionally spiking to earthworms (Eisenia fetida) was studied. The uptake and elimination kinetics of PFOS and PFOA fit a one-compartment first-order kinetic model. PFOS displayed higher uptake and lower elimination rate coefficients, and longer time to reach steady-state (t(ss)) than those of PFOA. The bioaccumulation factors (BAFs) of PFOS and PFOA ranged 1.54–4.12 and 0.52–1.34 g(soil) g(worm)(−1), respectively. The BAFs and tss decreased with increasing concentrations of PFOS and PFOA in soils. Stepwise multiple regression analysis was used to elucidate the bioavailability of PFOS and PFOA. The results showed that the total concentrations of PFOS and PFOA, and organic matter (OM) contents in soils explained 87.2% and 91.3% of the variation in bioavailable PFOS and PFOA, respectively. PFOS and PFOA concentrations exhibited positive influence and OM contents showed the negative influence on the accumulation of PFOS and PFOA in earthworms. Soil pH and clay contents played relatively unimportant role in PFOS and PFOA bioavailability.
authors.forename: Bei
authors.initials: B
authors.lastname: Wen
authors.forename: Hongna
authors.initials: H
authors.lastname: Zhang
authors.forename: Longfei
authors.initials: L
authors.lastname: Li
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Hu
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Xiao-quan
authors.initials: XQ
authors.lastname: Shan
authors.forename: Shuzhen
authors.initials: S
authors.lastname: Zhang
mesh_terms: D017738:Alkanesulfonic Acids / Q000032:analysis* / Q000493:pharmacokinetics; D000818:Animals; D001673:Biodegradation, Environmental; D001682:Biological Availability; D002210:Caprylates / Q000032:analysis* / Q000493:pharmacokinetics; D002681:China; D005466:Fluorocarbons / Q000032:analysis* / Q000493:pharmacokinetics; D007700:Kinetics; D009835:Oligochaeta / Q000737:chemistry* / Q000378:metabolism; D012987:Soil / Q000592:standards; D012989:Soil Pollutants / Q000032:analysis* / Q000493:pharmacokinetics
chemical_list: D017738:Alkanesulfonic Acids; D002210:Caprylates; D005466:Fluorocarbons; D012987:Soil; D012989:Soil Pollutants; C023036:perfluorooctanoic acid; C076994:perfluorooctane sulfonic acid