The European Pharmacopoeia has published significant revisions to its standards for pharmaceutical water in Ph. Eur. Issue 12.3, affecting WATER FOR INJECTIONS (0169), WATER, PURIFIED (0008), and TOTAL ORGANIC CARBON IN WATER FOR PHARMACEUTICAL USE (2.2.44). These changes represent a major step toward international harmonization, particularly with the USP, by adopting state-of-the-art testing methodologies.
Transition to TOC Testing for Sterilised Water (SWFI)
The most notable regulatory shift is the complete replacement of the traditional test for oxidisable substances with the Total Organic Carbon (TOC) test for Sterilised Water for Injections (SWFI). This is facilitated by the addition of Method B to General Chapter 2.2.44, which is specifically designed for SWFI. Notably, Method B introduces container-dependent TOC limits, defining three different acceptance criteria based on the size of the container.
Refinements for Bulk Water (WFI and Purified)
For both Water for Injections and Purified Water in bulk, the revisions focus on clarification and alignment without introducing entirely new content requirements:
- Methodological Consistency: for the TOC test in bulk water, the monographs now explicitly refer to Method A of Chapter 2.2.44.
- Numerical Precision: the TOC limit value has been updated from 0.5 mg/L to 50 mg/L to align with the concentration of the standards used in the general chapter.
- Conductivity Calibration: a metrological clarification has been added to the conductivity test. The accuracy of the measurement and the permissible deviation during system calibration must now be based on the expected conductivity value of the reference solution rather than the measured value.
Reagents and Implementation
To simplify laboratory processes and enable the use of USP reference standards, the reagents sucrose R and 1,4-benzoquinone R are being replaced by Chemical Reference Substances (CRSs).
These revised monographs are scheduled to officially come into force on 1 July 2026
SOURCES:
European Pharmacopoeia (Ph. Eur.) Issue 12.3