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A U.S. Geological Survey (USGS) scientist and his university colleagues have discovered a new source of methylmercury entering the waters of the eastern North Pacific Ocean. Consumption of ocean fish and shellfish account for over 90 percent of human methylmercury exposure in the United States, and tuna harvested in the Pacific Ocean account for 40 percent of this total exposure (Sunderland, 2007). Given the obvious importance of marine food webs to human methylmercury exposure, scientists were still trying to answer the question - where do fish, such as Pacific Ocean tuna, acquire their methylmercury? The findings of these scientists published in the journal Global Biogeochemical Cycles, might be a major step forward toward solving this mystery.
Divalent mercury (Hg(II)) can combine with sulfur, oxygen, and chlorine to form mercury salts. Mercuric chloride (HgCl2), which has been used as a preservative for water-quality samples for nutrient analysis, can cause gastrointestinal and kidney problems. Mercury sulfide (HgS) is the mineral cinnabar, which is mined as a source for mercury.
Organic mercury is mercury that has formed compounds with carbon. Methylmercury is the most common example of this form of mercury. Phenylmercury and dimethylmercury are other examples of organic mercury that had medical and commercial uses. They are rarely found in the environment. Methylmercury and ethylmercury compounds were once used as fungicides; however, their use was banned in the 1970s due to their adverse health effects.
Insn't it amazingly dissapointing and incomprehensive how much we are still abusing the plannet and the rest of Earthlings?
But the area is filled with something besides plankton: trash, millions of pounds of it, most of it plastic. It's the largest landfill in the world, and it floats in the middle of the ocean.
In some areas, the amount of plastic outweighs the amount of plankton by a ratio of six to one