Title
Humic acids increase dissolved lead bioavailability for marine invertebrates
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Easton, Pa ,
Subject
Biology
Source (journal)
Environmental science and technology / American Chemical Society. - Easton, Pa
Volume/pages
41(2007) :16 , p. 5679-5684
ISSN
0013-936X
ISI
000248886000021
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The presence of dissolved organic matter (DOM), as humic acids (HA), in natural waters is assumed to decrease dissolved metal bioavailability by binding metal ions and, therefore, decreasing the free ion concentration in solution. In this study, Pb complexation by HA in artificial seawater was checked by means of square wave anodic stripping voltammetry (SWASV). Uptake and toxicity of this metal in the absence and presence of HA was tested using excised gills of Mytilus edulis and the Paracentrotus lividus embryo-larval bioassay respectively. Both Pb uptake by mussel gills and Pb toxicity to sea urchin larvae increased in the presence of HA, and this increase was higher at higher HA concentrations. Since it is shown that the presence of DOM can enhance the uptake and toxicity of lead in some important marine invertebrate species, these results challenge the general applicability of the free ion activity and related models used for deriving environmental water quality criteria for metals.
E-info
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