Trace element

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A trace element is present in only a small amount. The amount depends on context.

In geology, its 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.