The third example metadata standard, in JSON-LD format, is not about an analytical method at all.  Standard reference materials are vital resources in chemical analysis to show accuracy of new and revised analytical methods and verify the accuracy of chemical analysis over time.  Agencies that produce standard methods perform rigorous chemical analysis (using two or more analytical techniques) to report certified values for analytes.  Thus, ChAMP can be used to capture metadata about the material itself and also the methods of analysis used to determine analytes in the material.

[Other links: ChAMP JSON-LD ContextChAMP Journal Article JSON-LD ExampleChAMP Standard Method JSON-LD Example]

JSON-LD Context

refmaterial context

Example File - NIST SRM 3668

refmaterial jsonld