| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Accumulation of Copper and Zinc inPeriphyton in Response to DynamicVariations of Metal Speciation inFreshwater
|
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - Although the free ion activity model (FIAM) has beenwell-established in laboratory studies, there remains theneed for field data in order to validate the applicability ofthis model in natural systems. The objective of thisstudy was to investigate the response of copper and zincaccumulation in periphyton to short-term variations inmetal concentration and speciation in freshwater. Duringheavy rain events, dissolved Cu in the Furtbach streamincreased from 40 to 118 nM, while dissolved Zn increasedfrom 45 to 147 nM due to the release of metals fromcontaminated sediments. Increases in free copper andfree zinc ions in the water (from 10-14 to 10-11.5 M for Cu2+;from 1 to 15 nM for Zn2+) were observed during theonset of heavy rain events. Periphytic algae collectedfrom artificial substrates had an intracellular copper content(0.2−2.8 μmol/g dry weight (dw)) that varied as a functionof the exchangeable copper in the water (labile form)rather than the free Cu2+. Intracellular zinc content (1.5−8.0 μmol/g dw) was found to follow the same trend asthe free zinc ion concentration. Adsorbed Cu and Zn onperiphyton showed a very dynamic response to variationsin dissolved metal concentration. Different concentrationsof dissolved manganese during the two time periods mayaffect the accumulation of zinc and copper by competitionfor metal uptake.
|
| article type
| |
| is part of this journal
| |
