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Article Journal of Environment and Health Science Mercury and its As...

Please take a look at this useful RG link.

Article Journal of Environment and Health Science Mercury and its As...

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Article Environmental Mercury and Its Toxic Effects

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Read Some interesting research articles

Environmental mercury and its toxic effects

Article Environmental Mercury and Its Toxic Effects

Human health effects of methylmercury exposure

Article Human Health Effects of Methylmercury Exposure

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Methyl mercury exposure in populations at risk: Analysis of NHANES 2011-2012

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Sadanand Pandey I appreciate that very much, my colleague

Adverse effects of mercury:

• Mercury is a naturally occurring element that is found in air, water and soil.
• Exposure to mercury – even small amounts – may cause serious health problems, and is a threat to the development of the child in utero and early in life.
• Mercury may have toxic effects on the nervous, digestive and immune systems, and on lungs, kidneys, skin and eyes.
• Mercury is considered by WHO as one of the top ten chemicals or groups of chemicals of major public health concern.
• People are mainly exposed to methylmercury, an organic compound, when they eat fish and shellfish that contain the compound.
• Methylmercury is very different to ethylmercury. Ethylmercury is used as a preservative in some vaccines and does not pose a health risk.
• Ref.: https://www.who.int/news-room/fact-sheets/detail/mercury-and-health

Mercury is a persistent, bioaccumulative, toxic pollutant. When released into the environment, it accumulates in water-laid sediments where it converts into toxic methylmercury and enters the food chain.

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G.V.P. Samaranayake I appreciate that very much, my colleague

Although mercury is a globally dispersed contaminant, it is not a problem everywhere. Aside from grossly polluted environments, mercury is normally a problem only where the rate of the natural formation of methylmercury from inorganic mercury is greater than the reverse reaction. Methylmercury is the only form of mercury that accumulates appreciably in fish. Environments that are known to favor the production of methylmercury include certain types of wetlands, dilute low-pH lakes in Northeast and Northcentral United States, parts of the Florida Everglades, newly flooded reservoirs, and coastal wetlands, particularly along the Gulf of Mexico, Atlantic Ocean, and San Francisco Bay. In highly polluted areas where mercury has accumulated through industrial or mining activities, natural processes may bury, dilute, or erode the mercury deposits, resulting in declines in concentration. In many relatively pristine areas, however, mercury concentrations have actually increased because atmospheric deposition has increased. Some sites may have become methylmercury hot spots inadvertently through human activities. Lake acidification, the addition of substances like sulfur that stimulate methylation, and the mobilization of mercury in soils in newly flooded reservoirs or constructed wetlands have been shown to increase the likelihood that mercury will become a problem in fish.

https://www2.usgs.gov/themes/factsheet/146-00/

Mercury emissions know no national or continental boundaries. Mercury emitted into the air can travel thousands of miles in the atmosphere before it is eventually deposited back to the earth in rainfall or in dry gaseous form.  Kindly check the following link:

https://www.epa.gov/international-cooperation/mercury-emissions-global-context

Atmospheric deposition is the dominant mechanism for the presence of mercury in the biosphere and the combustion of coal, most prominently from generators of electricity, is the dominant source. It is emitted in three species: divalent or ionic forms of mercury (HgII) are highly reactive and are most readily converted to MeHg. The methylation process takes place within aquatic sediments with low or no oxygen present, and through the action of sulfur-reducing bacteria. It has been established that higher levels of sulfur, as from acidic deposition entering aquatic systems, will result in higher levels of MeHg production in those systems. It has been hypothesized that the increased temperatures anticipated with climate change may speed the methylation process.

https://webcam.srs.fs.fed.us/impacts/mercury/index.shtml