An improved and accurate procedure for the determination of vitamin A

Abstract

A rapid and accurate procedure is described for determining vitamin A with trichloroacetic acid. Water-free reagents are prepared less than 3 h before use and the colorimetric readings are made by using a fast-measurement accessory and a slave recorder. The use of this accessory enables the rapid mixing of the colour reagent with the solution to be tested and the reading of results to be carried out within 1 s.