Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/16997
Title: Methylmercury Modulation in Amazon Rivers Linked to Basin Characteristics and Seasonal Flood-Pulse
Authors: Kasper, Daniele
Forsberg, Bruce Rider
Amaral, João Henrique Fernandes
Py-Daniel, Sarah S.
Bastos, Wanderley Rodrigues
Malm, Olaf
Keywords: Mercury Compounds
Rivers
Wetlands
Amazon River
Basin Characteristics
Demethylation
Flooded Areas
Lower Correlation
Methyl Mercury
Poorly Drained Soils
Sampling Site
Floods
Dissolved Oxygen
Methyl Mercury
Methylmercury Derivative
Adsorption
Concentration (composition)
Discharge
Flood
Methylation
Methyl Mercury
Seasonal Variation
Wetland
Absorption
Amazonas
Catchment
Comparative Study
Concentration (parameters)
Degradation
Demethylation
Environmental Impact
Floodplain
Modulation
River Basin
Seasonal Variation
Surface Water Hydrology
Water Sampling
Environmental Monitoring
Flooding
River
Season
Water Pollutant
Amazon Basin
Amazonas
Rio Negro Basin
Solimoes Basin
Environmental Monitoring
Floods
Methylmercury Compounds
Rivers
Seasons
Water Pollutants, Chemical
Issue Date: 2017
metadata.dc.publisher.journal: Environmental Science and Technology
metadata.dc.relation.ispartof: Volume 51, Número 24, Pags. 14182-14191
Abstract: We investigated the impact of the seasonal inundation of wetlands on methylmercury (MeHg) concentration dynamics in the Amazon river system. We sampled 38 sites along the Solimões/Amazon and Negro rivers and their tributaries during distinct phases of the annual flood-pulse. MeHg dynamics in both basins was contrasted to provide insight into the factors controlling export of MeHg to the Amazon system. The export of MeHg by rivers was substantially higher during high-water in both basins since elevated MeHg concentrations and discharge occurred during this time. MeHg concentration was positively correlated to %flooded area upstream of the sampling site in the Solimões/Amazon Basin with the best correlation obtained using 100 km buffers instead of whole basin areas. The lower correlations obtained with the whole basin apparently reflected variable losses of MeHg exported from upstream wetlands due to demethylation, absorption, deposition, and degradation before reaching the sampling site. A similar correlation between %flooded area and MeHg concentrations was not observed in the Negro Basin probably due to the variable export of MeHg from poorly drained soils that are abundant in this basin but not consistently flooded. © 2017 American Chemical Society.
metadata.dc.identifier.doi: 10.1021/acs.est.7b04374
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