The International Pharmacopoeia Twelfth Edition - Pharmacopoea Internationalis Editio XII: Supplementary information: Reference Substances and Reference Spectra: General guidelines for the establishment, maintenance and distribution of chemical reference substances1: Part B. Secondary chemical reference substances

Supplementary information: Reference Substances and Reference Spectra: General guidelines for the establishment, maintenance and distribution of chemical reference substances¹: Part B. Secondary chemical reference substances

This new Part B is intended to apply to secondary reference substances supplied as “ofﬁcial”, e.g. regional or national standards. In principle, secondary reference standards prepared by manufacturers can be prepared as “working standards” using the same procedures.