Physicochemical factors affecting the spatial variance of monomethylmercury in artificial reservoirs
| Autor: | Young-Hee Kim, Kyunghee Choi, Jong-Hyeon Lee, Seam Noh, Chan-Kook Kim, Seunghee Han |
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| Rok vydání: | 2016 |
| Předmět: |
Chlorophyll
Geologic Sediments 010504 meteorology & atmospheric sciences Hydraulic retention time Health Toxicology and Mutagenesis Drainage basin Fresh Water 010501 environmental sciences Toxicology 01 natural sciences chemistry.chemical_compound Nutrient Dissolved organic carbon Precipitation Sulfate 0105 earth and related environmental sciences Hydrology geography geography.geographical_feature_category Sulfates Chlorophyll A Mercury General Medicine Methylmercury Compounds Particulates Pollution chemistry Environmental chemistry Environmental science Particulate Matter Eutrophication Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Environmental Pollution. 208:345-353 |
| ISSN: | 0269-7491 |
| Popis: | The aim of this study was to identify how hydrologic factors (e.g., rainfall, maximum depth, reservoir and catchment area, and water residence time) and water chemistry factors (e.g., conductivity, pH, suspended particulate matter, chlorophyll-a, dissolved organic carbon, and sulfate) interact to affect the spatial variance in monomethylmercury (MMHg) concentration in nine artificial reservoirs. We hypothesized that the MMHg concentration of reservoir water would be higher in eutrophic than in oligotrophic reservoirs because increased dissolved organic matter and sulfate in eutrophic reservoirs can promote in situ production of MMHg. Multiple tools, including Pearson correlation, a self-organizing map, and principal component analysis, were applied in the statistical modeling of Hg species. The results showed that rainfall amount and hydraulic residence time best explained the variance of dissolved Hg and dissolved MMHg in reservoir water. High precipitation events and residence time may mobilize Hg and MMHg in the catchment and reservoir sediment, respectively. On the contrary, algal biomass was a key predictor of the variance of the percentage fraction of unfiltered MMHg over unfiltered Hg (%MMHg). The creation of suboxic conditions and the supply of sulfate subsequent to the algal decomposition seemed to support enhanced %MMHg in the bloom reservoirs. Thus, the nutrient supply should be carefully managed to limit increases in the %MMHg/Hg of temperate reservoirs. |
| Databáze: | OpenAIRE |
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