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In geochemistry, a trace element is a chemical element whose concentration is less than 1000 ppm or 0.1% of a rock's composition.
en.wikipedia.org It is the workhouse of the laboratory and is used for trace element analysis via accelerator mass spectroscopy.
en.wikipedia.org This interpretation is supported by additional trace element data, but is also the subject of debate.
en.wikipedia.org This instrument can allow for greater chemical resolution but can only measure one trace element at a time.
en.wikipedia.org Selenium is a trace element involved in proteins that are antioxidants.
en.wikipedia.org