For Trace element we have terms and definitions in 3 topics. The topics are Cancer, Nutrition and Sanitation.

A chemical found in very small amounts in a given substance. Organisms need certain trace elements to survive.
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A mineral required by the body in extremely small quantities.
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Any element in water or wastewater that, for reasons associated with natural distribution, industrial use, solubility or other factor, is present at very low concentrations.
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