Journal ArticleDOI
Influence of metal speciation in natural freshwater on bioaccumulation of copper and zinc in periphyton: a microcosm study.
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TLDR
The free ion activity model (FIAM) has already been confirmed under laboratory conditions for many trace metals but has still to be validated under natural conditions where the presence of natural organic ligands influences metal speciation and bioavailability as discussed by the authors.Abstract:
The free ion activity model (FIAM) has already been confirmed under laboratory conditions for many trace metals but has still to be validated under natural conditions where the presence of natural organic ligands influences metal speciation and bioavailability. The goal of this study was to test if the FIAM is followed under natural conditions by measuring copper and zinc speciation as well as metal accumulation in periphyton. Periphyton was exposed in microcosms to natural river water with different added concentrations of copper (25−258 nM) or zinc (18−501 nM) and additions of a synthetic ligand (NTA). Free Cu2+ was in the range of 10-16.5−10-14.5 M and Zn2+ was in the range of 0.7−8.7 nM, as measured by competitive ligand exchange coupled with cathodic/anodic stripping voltammetry. Other metal complexes were either measured or computed. Bioaccumulation of zinc in periphyton appeared to be controlled by the free zinc ion concentration, confirming the FIAM. In contrast, bioaccumulation of copper was cont...read more
Citations
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Journal ArticleDOI
Measuring free metal ion concentrations in situ in natural waters using the Donnan Membrane Technique.
TL;DR: It is shown that DMT can follow changes in the free metal ion concentration on times scales less than a day under certain conditions and a field DMT cell is developed that can be applied in situ in natural waters.
Journal ArticleDOI
When are metal complexes bioavailable
TL;DR: In this paper, the authors summarize the studies where the classic models fail and organize them into categories based on the different uptake pathways and kinetic processes, and summarize the mechanisms involved in the interaction of metal complexes with organisms and to improve the predictive capability of classic models when dealing with complexes.
Journal ArticleDOI
Metal complexes increase uptake of Zn and Cu by plants: implications for uptake and deficiency studies in chelator-buffered solutions
TL;DR: In this article, the authors measured the free metal-ion activity of Zn and Cu in chelator-buffered or resin (Chelex)-buffered solutions under Zn-deficient and nondeficient conditions.
Metal complexes increase uptake of Zn and Cu by plants: implications for uptake and deficiency studies
TL;DR: In this paper, the free-ion hypothesis has been used for the inter pretation and prediction of metal uptake, but several exceptions have been reported where metal complexes also affected metal uptake by plants.
Journal ArticleDOI
Hydrological and geochemical control of metals and arsenic in a Mediterranean river contaminated by acid mine drainage (the Amous River, France); preliminary assessment of impacts on fish (Leuciscus cephalus)
Corinne Casiot,Marion Egal,Françoise Elbaz-Poulichet,Odile Bruneel,Chrystelle Bancon-Montigny,Marie-Ange Cordier,Elena Gomez,Catherine Aliaume +7 more
TL;DR: In this article, the Amous River downstream of its confluence with a creek severely affected by acid mine drainage (AMD) originating from a former Pb-Zn mine was monitored over a 5 year period.
References
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Journal ArticleDOI
Biotic ligand model of the acute toxicity of metals. 1. Technical Basis
Dominic M. Di Toro,Herbert E. Allen,Harold L. Bergman,Joseph S. Meyer,Paul R. Paquin,Robert C. Santore +5 more
TL;DR: The biotic ligand model (BLM) of acute metal toxicity to aquatic organisms is based on the idea that mortality occurs when the metal-biotic ligand complex reaches a critical concentration.
Journal ArticleDOI
Reduction of marine phytoplankton reproduction rates by copper and cadmium
TL;DR: Comparison of data with natural concentrations in sea water implies that cadmium is not an important ecological factor in unpolluted waters but natural copper concentrations may inhibit the reproduction of some phytoplankton species, especially cyanobacteria, in upwelled sea water.
Journal ArticleDOI
Copper complexation in the Northeast Pacific
TL;DR: Copper titrations were conducted at sea with differential pulse anodic stripping voltammetry to examine the degree to which copper was associated with organic ligands as discussed by the authors, finding that approximately 50-70% of the total dissolved copper was in the organically complexed form.
Journal ArticleDOI
Processes regulating cellular metal accumulation and physiological effects : Phytoplankton as model systems
TL;DR: In this paper, a model system for investigating the processes and associated chemical and biological factors regulating cellular metal accumulation and resultant physiological effects is presented, where the amount of metal accumulated within cells represents a balance between the rate of metal uptake and the cellular growth rate, the effective biodilution rate.
Journal ArticleDOI
Feedback interactions between zinc and phytoplankton in seawater
TL;DR: Measured relationships between cellular Zn : C ratios and (Zn'+) agreed well with those computed from a modified Redfield model based on depth profiles for Zn and PO, concentrations and Zn chelation in theNutricline of the North Pacific, providing evidence that Zn concentrations in the nutricline are controlled by biological uptake and regen- eration as occurs for major nutrients.
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