title: Bioconcentration of perfluoroalkyl substances by Chironomus plumosus larvae in water with different types of dissolved organic matters.
abstract: The effects of four types of dissolved organic matters (DOM) on the bioconcentration of perfluoroalkyl substances (PFASs) in Chironomus plumosus larvae have been studied. The PFASs included perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnA), and perfluorododecanoic acid (PFDoA). The DOM included humic acid (HA), fulvic acid (FA), tannic acid (TA), and a protein, peptone (PEP), and their concentrations ranged from 0 to 50 mg L(-1). The results showed that, upon bioconcentration equilibrium, the body burdens of longer perfluoroalkyl chain PFASs (PFOS, PFDA, PFUnA and PFDoA) decreased with PEP and HA concentrations while increased with FA and TA concentrations. When FA and TA concentrations increased from 0 to 50 mg L(-1), body burdens of these PFASs increased by 7.5%-148.8% and 5.7%-37.1%, respectively. However, the DOM had no significant impact on the body burdens of shorter perfluoroalkyl chain PFASs (PFOA and PFNA). All of the four types of DOM lowered not only the uptake rate constants (ku) of PFASs due to the decrease of freely dissolved PFAS concentrations, but also the elimination rate constants (ke) due to the inhibition effect of DOM on the PFAS elimination from the larvae. The reduction in the two constants varied with both DOM and PFAS types. In the presence of PEP and HA with larger molecular weights, the ku values decreased more than ke, leading to the decreased body burdens of longer perfluoroalkyl chain PFASs. As for FA and TA with smaller molecular weights, the ke values decreased more than ku, resulting in increased body burdens of longer perfluoroalkyl chain PFASs. This study suggests that the effects of DOM on PFAS bioconcentration depend not only on the concentration but also on the molecule weight of DOM, which should be considered in the bioavailability assessment of PFASs.
authors.affiliation: School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China.
authors.forename: Wu
authors.initials: W
authors.lastname: Wen
authors.affiliation: School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China. Electronic address: xiaxh@bnu.edu.cn.
authors.forename: Xinghui
authors.initials: X
authors.lastname: Xia
authors.affiliation: School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.affiliation: School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China.
authors.forename: Haotian
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China.
authors.forename: Baotong
authors.initials: B
authors.lastname: Zhu
authors.affiliation: School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China.
authors.forename: Husheng
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
mesh_terms: D017738:Alkanesulfonic Acids / Q000737:chemistry / Q000493:pharmacokinetics; D000818:Animals; D001578:Benzopyrans / Q000737:chemistry; D001822:Body Burden; D002210:Caprylates / Q000737:chemistry / Q000493:pharmacokinetics; D002683:Chironomidae / Q000378:metabolism*; D003652:Decanoic Acids / Q000737:chemistry / Q000493:pharmacokinetics; D005466:Fluorocarbons / Q000737:chemistry / Q000493:pharmacokinetics*; D020387:Food Chain; D006812:Humic Substances; D007814:Larva / Q000378:metabolism; D010461:Peptones / Q000737:chemistry; D013634:Tannins / Q000737:chemistry; D014867:Water; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000493:pharmacokinetics*
chemical_list: D017738:Alkanesulfonic Acids; D001578:Benzopyrans; D002210:Caprylates; D003652:Decanoic Acids; D005466:Fluorocarbons; D006812:Humic Substances; D010461:Peptones; D013634:Tannins; D014874:Water Pollutants, Chemical; D014867:Water; C036567:perfluorodecanoic acid; C023036:perfluorooctanoic acid; C076994:perfluorooctane sulfonic acid; C005023:fulvic acid
keywords: Bioavailability; Bioconcentration; Dissolved organic matters (DOM); Perfluoroalkyl substances (PFASs); Proteins