isotopically labelled 

https://doi.org/10.1351/goldbook.I03336
Describes a mixture of an isotopically unmodified compound with one or more analogous isotopically substituted compound(s).
Sources:
Blue Book, p. 514 [Terms] [Book]
PAC, 1981, 53, 1887. (Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds) on page 1891 [Terms] [Paper]
Citation: 'isotopically labelled' 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.I03336 RIS BibTex EndNote
Div. IIDiv. VIIIPDFTextXMLJSON
Last revised: February 24, 2014