Trace element, also called micronutrient, in biology, any chemical element required by living organisms in minute amounts usually as part of a vital enzyme. Exact needs vary among species, but commonly required plant trace elements include copper, boron, zinc, manganese, and molybdenum. The term trace element also appears in geology, where it is used to describe elements other than oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium that occur in minuscule concentrations in rocks that is, in concentrations of less than 0.1 percent by weight. Trace element concentrations are typically expressed in parts per million.
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Journal of Geology and Geoscience 