Accueil >  Term: natural occurrence
natural occurrence

Presence of a substance in nature, as distinct from presence resulting from inputs from human activities.

Note: The contamination of the natural environment by some man-made compounds may be so widespread that it is practically impossible to get access to biota with a truly natural level; only ‘normal’ levels can be measured, those which are usually prevalent in places where there is no obvious local contamination.

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  • Walter Lane
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