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; see List of micronutrients.

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. Trace elements will either prefer liquid or solid phase. If compatible with an mineral, it will prefer a solid phase (E.G. Ni compatible with Olivine). If it is incompatible with an element it will prefer a liquid phase. The measurement of this ratio is known as the partition coefficient

References

  1. H. J. M. Bowen, Trace Elements in Biochemistry. Academic Press, 1966. (2nd edition, 1976.)

See also

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et:Jälgelement fr:Trace (chimie) he:יסוד קורט ja:微量元素 ko:미량 원소 ta:இம்மியப் பொருள் th:จุลธาตุ