natural occurrence

https://doi.org/10.1351/goldbook.15910
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.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1268 [Terms] [Paper]
Citation: 'natural occurrence' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.15910 RIS BibTex EndNote
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