Trace element

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In analytical chemistry, a trace element is an element in a sample that has an average concentration of less than 100 parts per million (ppm) measured in atomic count, or less than 100 micrograms per gram.

In biochemistry, a trace element is a chemical element that is needed in minute quantities for the proper growth, development, and physiology of the organism.[1] In biochemistry, a trace element is also referred to as a micronutrient. See Cofactor.

In geology, a trace element is a chemical element whose concentration is less than 1000 ppm or 0.1% of a rock's composition. The term is used mainly in igneous petrology.

References[change | change source]

  1. H.J.M. Bowen 1976. Trace elements in biochemistry. 2nd ed, Academic Press.