The vials were then cooled to ambient temperature, and the contents diluted to 25 mL with water in avolumetric flask. The diluted solution (10 mL) was mixed with0.5 mL of I2/KI solution (0.2 g I2and 2 g KI dissolved in 100 mLof water), and the mixture was adjusted to a final volume of 50 mL in a volumetric flask with diluted water. The absorbancewas measured at 625 nm