mercury to vapour ?
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Explanation:
After exposure to mercury vapor, the element is at first found in blood as physically dissolved elemental mercury that can pass cell membranes of the erythrocytes and other cells. Within a few minutes, the mercury is oxidized to mercuric mercury, a reaction catalyzed by catalase. Thus, following short-term exposure to mercury vapor, the maximum concentration of mercury in erythrocytes is seen after less than 1 h, whereas plasma levels peak after about 10 h. Before oxidation, elemental mercury readily crosses the blood–brain barrier and the placental barrier. After oxidation, the Hg2+ ions in serum are distributed to the kidneys as a main retention site. The uptake and/or elimination of mercury after exposure to mercury vapor can be altered by a moderate intake of ethanol, possibly due to inhibition of the catalase enzyme. Thus, the amount of mercury in red blood cells of humans exposed to mercury vapor is significantly reduced in the humans given an alcoholic beverage before the mercury exposure. Likewise, after alcohol intake, mercury vapor can be detected in the breath of subjects with an increased amount of inorganic mercury in the blood.
In the blood, mercuric mercury is divided between erythrocytes and plasma in about equal amounts. In erythrocytes, mercury is probably to a large extent bound to sulfhydryl groups on the hemoglobin molecule and possibly also to glutathione. The distribution between different plasma protein fractions varies with dose and time after exposure. Mercuric mercury crosses the blood–brain and placental barriers only very slowly. While the kidneys are the predominant site of inorganic mercury retention, the rate of uptake from blood and different organs varies widely; so does the rate of elimination from different organs. Inorganic mercuric mercury can induce metallothionein production in the liver, and a large proportion of the mercury in the kidneys is soluble and bound to metallothionein.
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After exposure to mercury vapour the element as it first found in blood as physical dissolved elemental mercury that can pass cell memberance erythocytes and other cells . Within a few minutes , a mercury is oxidized to mercuric mercury , a reaction catalyzed by catalase .
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