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Much of the methyl mercury that enters the atmosphere may be dimethyl mercury, $\text{(CH}_3\text{)}_2\text{Hg}$. This is a very volatile compound which, if it were pure, would have 50 mm mercury or more vapor pressure at 20°C. Complexes involving more electronegative ligands, such as the chloride $\text{CH}_3\text{HgCl}$, are significantly less volatile, ...

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