| Title: | Can acid volatile sulfides (AVS) influence metal concentrations in the macrophyte Myriophyllum aquaticum? |
| Author(s): | Teuchies J; De Jonge M; Meire P; Blust R; Bervoets L; |
| Address: | "Department of Biology, Ecosystem Management Research Group, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium. johannes.teuchies@ua.ac.be" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "The difference between the molar concentrations of simultaneously extracted metals (SEM) and acid volatile sulfides (AVS) is widely used to predict metal availability toward invertebrates in hypoxic sediments. However, this model is poorly investigated for macrophytes. The present study evaluates metal accumulation in roots and stems of the macrophyte Myriophyllum aquaticum during a 54 day lab experiment. The macrophytes, rooting in metal contaminated, hypoxic, and sulfide rich field sediments were exposed to surface water with 40% or 90% oxygen. High oxygen concentrations in the 90% treatment resulted in dissolution of the metal-sulfide complexes and a gradual increase in labile metal concentrations during the experiment. However, the general trend of increasing availability in the sediment with time was not translated in rising M. aquaticum metal concentrations. Processes at the root-sediment interface, e.g., radial oxygen loss (ROL) or the release of organic compounds by plant roots and their effect on metal availability in the rhizosphere may be of larger importance for metal accumulation than the bulk metal mobility predicted by the SEM-AVS model" |
| Keywords: | Magnoliopsida/*chemistry Metals/*chemistry Sulfides/*chemistry Volatilization; |
| Notes: | "MedlineTeuchies, Johannes De Jonge, Maarten Meire, Patrick Blust, Ronny Bervoets, Lieven eng Research Support, Non-U.S. Gov't 2012/08/03 Environ Sci Technol. 2012 Aug 21; 46(16):9129-37. doi: 10.1021/es300816y. Epub 2012 Aug 13" |
