Linking Cellulose Fiber Sediment Methyl Mercury Levels to Organic Matter Decay and Major Element Composition
| Autor: | Mark Elert, Anna Helena Falk, Lars Olof Höglund, Anders Svensson, Olof Regnell |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Sweden Time Factors Ecology Chemistry Aquatic ecosystem Geography Planning and Development chemistry.chemical_element Fresh Water General Medicine Contamination Methylmercury Compounds Sulfur Nitrogen Mercury (element) Cellulose fiber Environmental chemistry Report Environmental Chemistry Organic matter Surface layer Seasons Cellulose Water Pollutants Chemical |
| Popis: | Methylation of mercury (Hg) to highly toxic methyl Hg (MeHg), a process known to occur when organic matter (OM) decomposition leads to anoxia, is considered a worldwide threat to aquatic ecosystems and human health. We measured temporal and spatial variations in sediment MeHg, total Hg (THg), and major elements in a freshwater lagoon in Sweden polluted with Hg-laden cellulose fibers. Fiber decomposition, confined to a narrow surface layer, resulted in loss of carbon (C), uptake of nitrogen (N), phosphorus (P), and sulfur (S), and increased MeHg levels. Notably, fiber decomposition and subsequent erosion of fiber residues will cause buried contaminants to gradually come closer to the sediment-water interface. At an adjacent site where decomposed fiber accumulated, there was a gain in C and a loss of S when MeHg increased. As evidenced by correlation patterns and vertical chemical profiles, reduced S may have fueled C-fixation and Hg methylation at this site. |
| Databáze: | OpenAIRE |
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