Comments on validity

Limited suitability

Several methods of determination included in this series no longer conform to the current rules and standards with respect to validation, limits of detection and sampling, but can be used for special tasks or as a basis for further developing the procedures. These methods are classified in the following categories and are designated as being of limited suitability:

E1: Validation does not conform to the current requirements.
E2: Insufficient limit of detection according to the current requirements.
E3: Sampling does not conform to the current requirements.

Withdrawn

A method of determination is designated as withdrawn if the procedure has been replaced by a more recent, approved procedure that is based on the same method or if the method applied is obsolete, can no longer be validated or is defective.