Trace element
From MedBib.com - Medicine & Nature
In analytical chemistry, a trace element is an element in a sample that has an average concentration of less than 100 parts per million 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.
In geochemistry, 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
- ^ H. J. M. Bowen, Trace Elements in Biochemistry. Academic Press, 1966. (2nd edition, 1976.)
See also
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