Data of the spectrophotometric determination of 8-hydroxyquinoline are given in Table i. Determination Procedure. Approximately 0.2 g of the 8-hydroxyquinoline paste (accurately weighed) is placed in a i00 ml volumetric flask and dissolved in I0 ml of alcohol and the water is added up to the mark. A 1 ml portion of the solution is tbln placed in a 200 ml flask and brought up to the mark with water. The optical density of the solution is measured with reference to water at 240 nm. For the calculation, we used the optical density of a standard solution containing about 0.0020 mg/ml of 8-hydroxyquinoli ne (satisfying the re