Titre :
|
Effects of humic substances on the bioconcentration of polycyclic aromatic hydrocarbons: Correlations with spectroscopic and chemical properties of humic substances
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Auteurs :
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M. Haitzer ;
G. Abbt-braun ;
W. Traunspurger ;
C. Steinberg
|
Type de document :
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article/chapitre/communication
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Année de publication :
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1999
|
Format :
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p. 2782-2788
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Langues:
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= Anglais
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Catégories :
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EAU
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Mots-clés:
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MATIERE ORGANIQUE
;
DERIVE AROMATIQUE
;
MILIEU AQUATIQUE
;
NEMATODE
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Résumé :
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The presence of dissolved humic substances (HS, fulvic and humic acids) generally reduces the uptake of hydrophobic organic compounds into aquatic organisms. The extent of this effect depends both on the concentration and on the origin of the HS. The aim of this study was to investigate the role of qualitative differences between HS from different origins. The effects of seven different HS on the bioconcentration of pyrene and benzo[a]pyrene (BaP) in the nematode Caenorhabditis elegans were related to the spectroscopic and chemical properties of the HS. The effect of each humic material on the bioconcentration of pyrene or BaP was quantified as a 'biologically determined' partition coefficient K-DOC. We observed significant linear relationships between K-DOC and the atomic H/C ratio, the specific absorptivity at 254 nm, the content of aromatic carbons (as determined by C-13 nuclear magnetic resonance spectroscopy, the copper-complexing capacity, the content of phenolic OH groups, and the molecular weight of the HS. There was no discernible relationship of K-DOC with the atomic (N + O)/C ratio, an indicator of the polarity of HS.
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Source :
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Environmental Toxicology and Chemistry, vol.18, n°12
|