1.1 ,This test method2^,3 covers organic solvents containing active oxygen in the range from 5 to 80 μ,g/g (ppm) or higher. By using a special reaction-absorption cell, the test method can be extended to cover the range from 0 to 5 ppm. The test method can be used to determine numerous peroxide classes of varying reactivity such as hydroperoxides, diacyl peroxides, diaroyl peroxides, peresters, and ketone peroxides. The stable di-tert-alkyl peroxides do not react under the conditions of analysis.