The Effects of pH and Dissolved Organic Carbon on the Toxicity of Cadmium and Copper to a Freshwater Bivalve: Further Support for the Extended Free Ion Activity Model

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dc.contributor.author Markich, SJ
dc.contributor.author Brown, PL
dc.contributor.author Jeffree, RA
dc.contributor.author Lim, RP
dc.date.accessioned 2009-12-21T02:29:30Z
dc.date.issued 2003-11
dc.identifier.citation Archives of Environmental Contamination and Toxicology, 2003, 45 (4), pp. 479 - 491
dc.identifier.issn 0090-4341
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3642
dc.description.abstract The extended free ion activity model (FIAM) was developed by integrating concepts from the original FIAM into biological receptor theory, to obtain a conceptual model that more precisely quantifies the interaction of chemical species at biological receptor sites. The extended FIAM was tested by determining the acute (48 h) valve movement behavior (VMB) (measured in terms of the duration of valve opening) of the Australian freshwater bivalve, Hyridella depressa, to increasing concentrations of total Cd or Cu, in a standard synthetic water under conditions of varying pH (6.5-7.5) and/or dissolved organic carbon (as model fulvic acid (FA)) concentrations (0-11.2 mg L-1). Valve movement behavior, measured using an automated data acquisition system, was shown to be a quantifiable and rapid, real-time endpoint for assessing the toxic effects of Cd and Cu exposures. The VMB of H. depressa to Cd was independent (p > 0.05) of pH and/or model FA concentration. In contrast, the VMB of H. depressa to Cu was highly dependent (p < 0.001) on pH and/or model FA concentration; individuals were more sensitive to Cu at low pH and model FA concentrations. The VMB of H. depressa was directly proportional to the activity of the free metal ion (Cd 2+), for the linear region of the concentration-response curves. In contrast, the VMB of H. depressa was a weighted function of the activities of the free metal ion and the 1:1 metal hydroxide species (i.e. 2.02 × Cu2+ + CuOH+), whereby Cu2+ had a two-fold greater binding affinity than CuOH+ at the cell membrane surface. Moreover, the results for Cd and Cu are consistent with the extended FIAM, as opposed to the original FIAM, where the result for Cu would be regarded as an exception. The extended FIAM explained 98% of the variability in VMB, whereas the original FIAM explained only 63% (i.e. an improvement of 35%). The improved predictability of organism response to Cu is relevant to advancing water quality guidelines for protecting aquatic biota.
dc.language eng
dc.relation.isbasedon 10.1007/s00244-003-2175-x
dc.title The Effects of pH and Dissolved Organic Carbon on the Toxicity of Cadmium and Copper to a Freshwater Bivalve: Further Support for the Extended Free Ion Activity Model
dc.type Journal Article
dc.description.version Published
dc.description.version Published
dc.description.version Published
dc.parent Archives of Environmental Contamination and Toxicology
dc.journal.volume 4
dc.journal.volume 45
dc.journal.number 4 en_US
dc.publocation New York, usa en_US
dc.identifier.startpage 479 en_US
dc.identifier.endpage 491 en_US
dc.cauo.name Dept of Environmental Biology en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 870336
dc.personcode 110409
dc.percentage 100 en_US
dc.classification.name Ecology en_US
dc.classification.type FOR-08 en_US
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)
utslib.collection.history School of the Environment (ID: 344)


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