title: Respiratory uptake kinetics of neutral hydrophobic organic chemicals in a marine benthic fish, Pseudopleuronectes yokohamae.
abstract: We investigated the respiratory uptake kinetics of polychlorinated biphenyls (PCBs), organohalogen pesticides (OCPs), polycyclic aromatic hydrocarbons (PAHs), and 2,2',4,4'-tetrabrominated diphenyl ether (BDE #47) in a marine benthic fish, Pseudopleuronectes yokohamae. The respiratory uptake efficiencies (EW) of the chemicals, of which there have been no reports for the majority of persistent organic pollutants (POPs), were obtained by measuring the respiratory uptake rate constants (k1) and the oxygen consumption rates of fish. Fish were exposed to water in which these chemicals were dissolved at environmentally relevant concentrations for 28 d, followed by 168 d of depuration in clean seawater. The k1 and EW values for 99 compounds were obtained, and they ranged from 2000 to 42000 L kg-lipid(-1) d(-1) and from 0.060 to 1.3, respectively. The EW values of the chemicals, except for PAHs, tended to increase with increasing values of the log octanol-water partition coefficients (KOW) of the chemicals up to a log KOW of 5. For log KOW in the range 3-5, the EW values in this study were much lower than those in a published study (about one-third). As a result of analysis by a two-phase resistance model, the resistance of transport rates to the lipid phase in this study was lower than was the case in the published study. These findings indicate that the EW predicted by the published study for log KOW in the range 3-5 may differ among fish species and water temperature, and further study is needed.
authors: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-8506, Japan; Faculty of Environmental and Symbiotic Science, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan. Electronic address: jkobayashi@pu-kumamoto.ac.jp.
authors: Jun
authors: J
authors: Kobayashi
authors: Takeo
authors: T
authors: Sakurai
authors: Kaoruko
authors: K
authors: Mizukawa
authors: Kyoko
authors: K
authors: Kinoshita
authors: Nozomi
authors: N
authors: Ito
authors: Shunji
authors: S
authors: Hashimoto
authors: Daisuke
authors: D
authors: Nakajima
authors: Toru
authors: T
authors: Kawai
authors: Yoshitaka
authors: Y
authors: Imaizumi
authors: Hideshige
authors: H
authors: Takada
authors: Noriyuki
authors: N
authors: Suzuki
mesh_terms: D000818:Animals; D005432:Flounder / Q000502:physiology*; D007700:Kinetics; D009930:Organic Chemicals / Q000378:metabolism*; D010575:Pesticides / Q000378:metabolism; D011078:Polychlorinated Biphenyls / Q000378:metabolism; D011084:Polycyclic Aromatic Hydrocarbons / Q000378:metabolism; D012119:Respiration; D012623:Seawater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D009930:Organic Chemicals; D010575:Pesticides; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls
keywords: Assimilation efficiency; Bioconcentration; Gill; Persistent organic pollutants; Rate constants