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Bioavailability of copper in contaminated sediments assessed by a DGT approach and the uptake of copper by the aquatic plantMyriophyllum aquaticum
- Source :
- Environmental Toxicology and Chemistry. 33:278-285
- Publication Year :
- 2014
- Publisher :
- Wiley, 2014.
-
Abstract
- The assessment of the potentially harmful effects of metals on biota depends on the speciation and bioavailability of the metals. In this study, we investigated copper accumulation and toxicity in the aquatic plant Myriophyllum aquaticum after exposure to artificial sediments varying in peat and/or ferric hydroxide content and spiked with Cu (5 to 200 mg.kg-1). Modeling of the kinetic DGT (diffusive gradient in thin film) measurements revealed fast and slow copper resupply from the solid phase for sediment formulated with and without peat, respectively. M. aquaticum proved to be sensitive to copper, as the copper accumulation and growth differed depending on the sediment composition and copper concentration. Comparing the copper accumulation in M. aquaticum to total dissolved, free and CDGT (concentration in solution derived from DGT measurements) copper concentrations revealed that CDGT concentrations were a better predictor of the accumulation than the others. However, the relatively weak correlation observed (r2=0.6) and the fact that plant uptake does not increase proportionally to fluxes to DGT suggest that copper uptake in plants was not diffusion limited. Thus, the free copper concentrations near the root surface were sufficient to meet the plant's demand during the experiment. Furthermore, labile complexes that continuously resupply the Cu2+ pool may also contribute to the Environmental Toxicology and Chemistry
- Subjects :
- 010504 meteorology & atmospheric sciences
biology
Chemistry
Health, Toxicology and Mutagenesis
media_common.quotation_subject
Myriophyllum aquaticum
Sediment
chemistry.chemical_element
010501 environmental sciences
biology.organism_classification
01 natural sciences
Copper
6. Clean water
Bioavailability
Speciation
13. Climate action
Aquatic plant
Environmental chemistry
Environmental toxicology
Environmental Chemistry
Composition (visual arts)
0105 earth and related environmental sciences
media_common
Subjects
Details
- ISSN :
- 07307268
- Volume :
- 33
- Database :
- OpenAIRE
- Journal :
- Environmental Toxicology and Chemistry
- Accession number :
- edsair.doi...........01da716490b7c516a1aec6754b2455d4