title: Sorption-desorption kinetics and toxic cell concentration in marine phytoplankton microalgae exposed to Linear Alkylbenzene Sulfonate.
abstract: Linear Alkylbenzene Sulfonates (LAS) are ubiquitous surfactants. Traces can be found in coastal environments. Sorption and toxicity of C(12)-LAS congeners were studied in controlled conditions (2-3500 μg C(12)LAS/L) in five marine phytoplanktonic species, using standardized methods. IC(50) values ranged from 0.5 to 2 mg LAS/L. Sorption of (14)C(12)-6 LAS isomer was measured at environmentally relevant trace levels (4μg/L) using liquid scintillation counting. Steady-state sorption on algae was reached within 5h in the order dinoflagellate>diatoms>green algae. The sorption data, fitted a L-type Freundlich isotherm, indicating saturation. Desorption was rapid but a low LAS fraction was still sorbed after 24h. Toxic cell concentration was 0.38±0.09 mg/g for the studied species. LAS toxicity results from sorption on biological membranes leading to non-specific disturbance of algal growth. Results indicate that LAS concentrations in coastal environments do not represent a risk for these organisms.
authors: International Atomic Energy Agency-Marine Environment Laboratories (IAEA-MEL), 4 Quai Antoine 1er, MC-98000 Principality of Monaco, Monaco, France. florent.renaud@unice.fr
authors: Florent
authors: F
authors: Renaud
authors: François
authors: F
authors: Oberhänsli
authors: Jean-Louis
authors: JL
authors: Teyssié
authors: Pierre
authors: P
authors: Miramand
authors: Ali
authors: A
authors: Temara
authors: Michel
authors: M
authors: Warnau
mesh_terms: D000327:Adsorption; D017738:Alkanesulfonic Acids / Q000378:metabolism* / Q000633:toxicity; D000460:Chlorophyta / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D017377:Diatoms / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D004141:Dinoflagellida / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D006131:Growth Inhibitors / Q000378:metabolism / Q000633:toxicity; D007700:Kinetics; D058086:Microalgae / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D010839:Phytoplankton / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D013501:Surface-Active Agents / Q000378:metabolism* / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000378:metabolism* / Q000633:toxicity
chemical_list: D017738:Alkanesulfonic Acids; D006131:Growth Inhibitors; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C030641:alkylbenzyl sulfonic acid