title: Toxicity of biodiesel, diesel and biodiesel/diesel blends: comparative sub-lethal effects of water-soluble fractions to microalgae species.
abstract: The water-soluble-fractions (WSF) from biodiesel and biodiesel/diesel blends were compared to diesel in their sub-lethal toxicity to microalgae. Chemical analyses of aromatics, non-aromatics hydrocarbons and methanol were carried out in the WSF, the former showing positive correlation with increasing diesel concentrations (B100 < B5 < B3 < B2 < D). Biodiesel interacted with the aqueous matrix, generating methanol, which showed lower toxicity than the diesel contaminants in blends. The WSF caused 50% culture growth inhibition (IC50-96 h) at concentrations varying from 2.3 to 85.6%, depending on the tested fuels and species. However, the same species sensitivity trend (S. costatum > N. oculata > T. chuii > P. subcapitata) was observed for all the tested fuels.
authors: LABIOMAR, Institute of Biology, Federal University of Bahia Campus Ondina, Av Oceânica 2353/403 Ondina, 40170-010 Salvador, Bahia, Brazil.
authors: Solange A
authors: SA
authors: Pereira
authors: Vinicius Queiroz
authors: VQ
authors: Araújo
authors: Marcio V
authors: MV
authors: Reboucas
authors: Fernanda Seabra V
authors: FS
authors: Vieira
authors: Marcos Vinicio A
authors: MV
authors: de Almeida
authors: Fabio A
authors: FA
authors: Chinalia
authors: Iracema Andrade
authors: IA
authors: Nascimento
mesh_terms: D056804:Biofuels / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D005742:Gasoline / Q000633:toxicity*; D058086:Microalgae / Q000187:drug effects*; D011084:Polycyclic Aromatic Hydrocarbons / Q000633:toxicity; D018570:Risk Assessment; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D056804:Biofuels; D005742:Gasoline; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical