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Effect of Organic Complexation on Copper Accumulation and Toxicity to the Estuarine Red Macroalga Ceramium tenuicorne: A Test of the Free Ion Activity Model
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2011 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 45, no 7, 3145-3153 p.Article in journal (Refereed) Published
Abstract [en]

Current water quality criteria (WQC) regulations on copper toxicity to biota are still based on total dissolved (<0.4 μm membrane filter) copper concentrations with a hardness modification for freshwaters. There are however ongoing efforts to incorporate metal speciation in WQC and toxicity regulations (such as the biotic ligand model-BLM) for copper and other metals. Here, we show that copper accumulation and growth inhibition of the Baltic macroalga Ceramium tenuicorne exposed to copper in artificial seawater at typical coastal and estuarine DOC concentrations (similar to 2−4 mg/L-C as fulvic acid) are better correlated to weakly complexed and total dissolved copper concentrations rather than the free copper concentration [Cu2+]. Our results using a combination of competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-ACSV) measurements and model calculations (using visual MINTEQ incorporating the Stockholm Humic Model) show that copper accumulation in C. tenuicorne only correlates linearly well to [Cu2+] at relatively high [Cu2+] and in the absence of fulvic acid. Thus the FIAM fails to describe copper accumulation in C. tenuicorne at copper and DOC concentrations typical of most marine waters. These results seem to indicate that at ambient total dissolved copper concentration in coastal and estuarine waters, C. tenuicorne might be able to access a sizable fraction of organically complexed copper when free copper concentration to the cell membrane is diffusion limited.

Place, publisher, year, edition, pages
2011. Vol. 45, no 7, 3145-3153 p.
National Category
Earth and Related Environmental Sciences
Research subject
Applied Environmental Science
Identifiers
URN: urn:nbn:se:su:diva-61989DOI: 10.1021/es1039166ISI: 000288841500094OAI: oai:DiVA.org:su-61989DiVA: diva2:439222
Available from: 2011-09-06 Created: 2011-09-06 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Release rates and toxicity of metals from anti-fouling paints and the role of chemical speciation
Open this publication in new window or tab >>Release rates and toxicity of metals from anti-fouling paints and the role of chemical speciation
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this doctoral thesis was to investigate and improve the risk assessment of anti-fouling paints. A new method, the Petri-dish method, was developed to determine release rates of copper and zinc from anti-fouling paints (Paper I). The release rates of zinc were substantially higher from the biocide-free leisure boat paints than from the biocide-leaching paints. In Paper II, the potential toxicity of paint leachates was assessed and the biocide-free paint proved to be the most toxic paint investigated. Zinc, a supposedly non-biocidal ingredient in copper-based and other antifouling paints, was found to contribute significantly to the observed toxicity of all leisure boat paints investigated. This means that risk assessment of an anti-fouling paint based on only the active biocidal ingredient in the formula is insufficient. A more holistic approach, based on hazard identification and dose-response assessment of anti-fouling paint leachate, with all ingredients taken into consideration, is recommended. This can be achieved by the Petri-dish method, which combines chemical analysis with ecotoxicological tests of paint leachates. In Paper III and IV, the effects of salinity and organic matter on copper bioaccumulation and toxicity to the red macroalga Ceramium tenuicorne were studied. Salinity had only a minor effect in ameliorating copper toxicity, whereas the organic matter concentration had a significant effect in reducing the bioavailability and hence copper toxicity at all salinities tested. Copper uptake and bioaccumulation by C. tenuicorne showed that the macroalga could access a sizeable fraction of organically-complexed copper in addition to Cu2+, when Cu2+ concentration to the cell membrane is diffusion limited. This observation implies that the setting of environmental quality standards (EQSs) for copper and other metals through the Biotic Ligand Model (BLM) is inappropriate in predicting copper uptake and hence toxicity to C. tenuicorne.

Place, publisher, year, edition, pages
Stockholm: Department of Applied Environmental Science (ITM), Stockholm University, 2011. 37 p.
Keyword
Anti-fouling paints, Toxicity test, Ceramium tenuicorne, Nitocra spinipes, Copper, Zinc, Free Ion Activity Model (FIAM)
National Category
Natural Sciences
Research subject
Applied Environmental Science
Identifiers
urn:nbn:se:su:diva-61992 (URN)978-91-7447-352-2 (ISBN)
Public defence
2011-10-21, William-Olssonsalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 09:30 (Swedish)
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Available from: 2011-09-29 Created: 2011-09-06 Last updated: 2011-09-19Bibliographically approved

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