Bioconcentration of linear alkylbenzene sulfonates and their degradation intermediates in marine algae.
Sorption experiments using different homologues of linear alkylbenzene sulfonate (LAS) and sulfophenylcarboxylic acid (SPC) on several marine microalgae have been carried out. The steady state seems to be reached in the first 4 hours. Longer exposure times lead to biodegradation of the compound and, therefore, to an overestimation of the bioconcentration factor. Sorption coefficients are higher for Nannochloropsis gaditana, for example, 1,293 Lkg(-1) for C11-LAS and 525 Lkg(-1) for C11-SPC versus 727 Lkg(-1) for C11-LAS and 28 Lkg(-1) for C11-SPC for Dunaliella salina. For both algae an increase in the sorption coefficient is observed when the polarity of the compound decreases (C5-SPC<C11-SPC<C11-LAS approximately/= C12-LAS). The sorption of C11-LAS on D. salina is fitted to a linear Freundlich isotherm (K=176+/-0.02, n=0.964+/-0.02).
Sáez
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Departamento de Química Física, Facultad de Ciencias del Mar, Universidad de Cádiz, Puerto Real, Spain.
Gómez-Parra
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A
González-Mazo
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D017738:Alkanesulfonic Acids / Q000032:analysis / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D056890:Eukaryota / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D012623:Seawater
D017738:Alkanesulfonic Acids; C030641:alkylbenzyl sulfonic acid