Absorption of divalent trace metals as analogues of calcium by Australian freshwater bivalves: an explanation of how water hardness reduces metal toxicity

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dc.contributor.author Markich, Scott en_US
dc.contributor.author Jeffree, Ross en_US
dc.contributor.editor en_US
dc.date.accessioned 2012-02-02T07:26:21Z
dc.date.available 2012-02-02T07:26:21Z
dc.date.issued 1994 en_US
dc.identifier 2010002074 en_US
dc.identifier.citation Markich Scott and Jeffree Ross 1994, 'Absorption of divalent trace metals as analogues of calcium by Australian freshwater bivalves: an explanation of how water hardness reduces metal toxicity', Elsevier Inc, vol. 29, pp. 257-290. en_US
dc.identifier.issn 0166-445X en_US
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/14879
dc.description.abstract A competitive inhibition experimental design, incorporating radiotracer labelling of metals and the geochemical simulation of their speciation at two varying Ca water concentrations, was employed to conclusively demonstrate that the divalent trace metals Pb, Mn, Cd and Co, were absorbed from the aquatic medium as metabolic analogues of Ca by two species of Australian freshwater bivalves (Hyridella depressa and Velesunio ambiguus). Several important implications stem from this mechanistic interpretation of metal uptake by aquatic organisms. Because of the general positive empirical relationship established between metal uptake/accumulation and acute/sub-chronic toxicity, the ameliorative effect of an increased water hardness on metal toxicity most likely results from the competitive binding of Ca (>Mg) at the Ca channels of the cell membrane. This conclusion is consistent with empirical studies and also with the basic chemical properties of Ca and Mg, that are relevant to their behaviour at the Ca channel. It follows that Ca water concentration, rather than total water hardness, should be utilised in water quality guidelines as the variable that governs the maximum permissible concentration of certain trace metals that can be sustained by freshwater life. en_US
dc.language en_US
dc.publisher Elsevier Inc en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/0166-445X(94)90072-8 en_US
dc.title Absorption of divalent trace metals as analogues of calcium by Australian freshwater bivalves: an explanation of how water hardness reduces metal toxicity en_US
dc.parent Aquatic Toxicology en_US
dc.journal.volume 29 en_US
dc.journal.number en_US
dc.publocation Amsterdam, Netherlands en_US
dc.identifier.startpage 257 en_US
dc.identifier.endpage 290 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 060100 en_US
dc.personcode 0000068951 en_US
dc.personcode 110409 en_US
dc.percentage 100 en_US
dc.classification.name Biochemistry and Cell Biology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Bivalve; Freshwater; Calcium; Trace metal; Metabolic analogue; Competitive inhibition en_US
dc.staffid en_US
dc.staffid 110409 en_US


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