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    <skos:prefLabel xml:lang="en">TRACE ELEMENTS</skos:prefLabel>
    <skos:changeNote>Date=2026-02-18 User Id=system System Note=Added narrower relation from TRACE ELEMENTS [6c320188-da7b-4d52-8e99-57d7ac401841] to TRACE METALS [84ab9e02-29d1-4e58-97c9-d9e14d97131a]</skos:changeNote>
    <gcmd:reference gcmd:text="Adapted from: Libes, S. 1992. An Introduction to Marine Biogeochemistry. John Wiley and Sons. p. 712." xml:lang="en"/>
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    <skos:definition xml:lang="en">An element whose dissolved concentration is between 50 and 0.05 micromolesper kilogram. Most are metals and can be referred to as trace metals.Specific names of trace elements may be entered as Detailed Variables.</skos:definition>
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