degree of biodegradation

https://doi.org/10.1351/goldbook.13893
Mass fraction of a substance that is biodegraded under specified conditions as measured through specified phenomena or techniques sensitive to mineral and biomass formations.
Note: Expressions like degree of biodegradability, extent of biodegradability, etc., are improper because a property reflected by the suffix "ity" cannot be quantified contrary to a deed reflected by "tion".
Source:
PAC, 2012, 84, 377. (Terminology for biorelated polymers and applications (IUPAC Recommendations 2012)) on page 388 [Terms] [Paper]