Inorganic Compounds
Metal and metalloid positive ions: Some of these ions (lead, mercury, and arsenic) are dangerous at extremely low concentrations and can be introduced into drinking water either though natural processes or as a result of human activity. Other ions in this group (for example, calcium, magnesium, sodium, and potassium) are essential to human health [...]
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Since childhood we have been told that fluoride is good for our teeth. It is added to the water supply of many regions for just that reason. Our children brush regularly with great quantities of it. But fluoride toxicity has been linked to bone disease, infant mortality and brain damage. And the line between safety [...]
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