title: Lipid-water partition coefficients and correlations with uptakes by algae of organic compounds.
abstract: In view of the scarcity of the lipid-water partition coefficients (Ktw) for organic compounds, the logKtw values for many environmental contaminants were measured using ultra-pure triolein as the model lipid. Classes of compounds studied include alkyl benzenes, halogenated benzenes, short-chain chlorinated hydrocarbons, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, and organochlorine pesticides. In addition to logKtw determination, the uptakes of these compounds from water by a dry algal species were measured to evaluate the lipid effect on the algal uptake. The measured logKtw are closely related to their respective logKow (octanol-water), with logKow=1.9 to 6.5. A significant difference is observed between the present and early measured logKtw for compounds with logKow>∼5, which is attributed to the presence and absence of a triolein microemulsion in water affecting the solute partitioning. The observed lipid-normalized algae-water distribution coefficients (logKaw/lipid) are virtually identical to the respective logKtw values, which manifests the dominant lipid-partition effect of the compounds with algae.
authors: Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 30011, Taiwan.
authors: Wei-Nung
authors: WN
authors: Hung
authors: Department of Environmental Engineering and Sustainable Environment Research Laboratory, National Cheng Kung University, Tainan 70101, Taiwan; U.S. Geological Survey, Denver Federal Center, Denver, CO 80225, USA. Electronic address: carychio@mail.ncku.edu.tw.
authors: Cary T
authors: CT
authors: Chiou
authors: Department of Environmental Engineering and Sustainable Environment Research Laboratory, National Cheng Kung University, Tainan 70101, Taiwan. Electronic address: tflin@mail.ncku.edu.tw.
authors: Tsair-Fuh
authors: TF
authors: Lin
mesh_terms: D000327:Adsorption; D002708:Chlorella / Q000737:chemistry / Q000378:metabolism*; D004785:Environmental Pollutants / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D008055:Lipids; D000442:Octanols / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry / Q000378:metabolism*; D012995:Solubility; D014867:Water / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D008055:Lipids; D000442:Octanols; D009930:Organic Chemicals; D014867:Water
keywords: Algal uptake; Bioconcentration; Lipid–water partition coefficient; Octanol–water partition coefficient; Organic compounds; Triolein