Photodemethylation
WebJun 27, 2010 · Methylmercury is a neurotoxin that accumulates in food webs and poses a significant risk to human health 1. In natural water bodies, methylmercury concentrations remain low due to the degradation... WebSep 21, 2015 · This study examined the kinetics of photoreduction of Hg ( II) and photodemethylation of methylmercury (MeHg +) attached to, or in the presence of, …
Photodemethylation
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WebJun 15, 2014 · Monomethyl mercury (MeHg) is a potent neurotoxin that threatens ecosystem viability and human health. In aquatic systems, the photolytic degradation of MeHg (photodemethylation) is an important component of the MeHg cycle. Dissolved organic matter (DOM) is also affected by exposure to solar radiation (light exposure) … Webphotodemethylation rate constant across seasons, indicating that DOM is a strong predictor of MeHg photodemethylation independent of seasonal effects. The two highest carbon lakes (BDW and PEB) had significantly higher energy-normalized photodemethylation rate constants in summer compared to fall
WebMethylmercury production and degradation under light and dark conditions in the water column of western US reservoirs Chris S. Eckley1, Todd P. Luxton2, Dave Krabbenhoft3, … WebJan 1, 2024 · 12 Photodemethylation is a complex multivariate function of chemical (e.g., DOM composition and concentration) and physical (light duration and intensity, water depth) variables presenting signi ...
WebConsidering the significance of photodemethylation suggested from our results, further studies that examine the association between the photodemethylation rate and shortwave radiation with different wavelengths and the roles of various seawater compositions, especially chlorophyll and dissolved organic matter (or DOC) are needed to better ... WebMost MeHg production within the water column appeared to occur in the spring when much of the water column was in the processes of becoming anoxic. In the surface waters, rates of photodemethylation were relatively large (up to -0.25 d-1) but quickly decreased at depths >0.5 m below the surface. These results can be used to identify the ...
WebPhotodemethylation of methoxy-substituted 9,10-anthraquinones in methanol Ronald L. Blankespoor Richard Hsung , and David L. Schutt Cite this: J. Org. Chem.1988, 53, 12, …
Weburing the rates of photodemethylation in water, this process was estimated to account for about 80% and 31.4% of the MeHg mobilized annually from sediments in a lake [31] and a wetland [32], respectively. In addition, a good inverse relationship was observed between MeHg concentrations and photodemethylation potentials in water column [32]. describe the primary processing of oatsWebFeb 7, 2015 · Photodemethylation rates were determined using incubation experiments with MeHg-spiked natural lake water. The authors determined full-spectrum exposure rates at … describe the principal dimensions of the shipWebThis study examined the kinetics of photoreduction of Hg(ii) and photodemethylation of methylmercury (MeHg(+)) attached to, or in the presence of, dissolved organic matter … describe the primary economic activityWebJun 15, 2014 · In aquatic systems, the photolytic degradation of MeHg (photodemethylation) is an important component of the MeHg cycle. Dissolved organic … describe the principateWebJul 1, 2009 · Photodemethylation (PD) is thought to be the most important biogeochemical sink of methylmercury (MeHg) in freshwater lakes. However, we possess little … describe the primitive atmosphere of earthWebFeb 7, 2015 · Photodemethylation rates were determined using incubation experiments with MeHg-spiked natural lake water. The authors determined full-spectrum exposure rates at all study sites and waveband-specific rates (photosynthetically active radiation, ultraviolet-A radiation, and ultraviolet-B radiation) at 1 clear-water (Sognsvann) and 1 humic ... describe the principles of preventative careWebJan 1, 2024 · Photodemethylation can be one of the primary processes for loss of neurotoxic methylmercury (MeHg) in freshwater lakes. Few studies have quantified seasonal variations in photodemethylation rate constants as a function of dissolved organic matter (DOM). We conducted 1-week irradiation experiments in two seasons to test for spatial … describe the principles of confidentiality