40 CFR 160.113 - Mixtures of substances with carriers.
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(a) For each test, control, or reference substance that is mixed with a carrier, tests by appropriate analytical methods shall be conducted:
(1) To determine the uniformity of the mixture and to determine, periodically, the concentration of the test, control, or reference substance in the mixture.
(2) When relevant to the conduct of the study, to determine the solubility of each test, control, or reference substance in the mixture by the testing facility or the sponsor before the experimental start date.
(3) To determine the stability of the test, control, or reference substance in the mixture before the experimental start date or concomitantly according to written standard operating procedures, which provide for periodic analysis of each batch.
(b) Where any of the components of the test, control, or reference substance carrier mixture has an expiration date, that date shall be clearly shown on the container. If more than one component has an expiration date, the earliest date shall be shown.
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.