0.5% bleaching powder solution was added to the preweighed PUC and agitated for 40–50 min at 60 °C. The cubes were then removed and dried in a hot air oven at 105–110 °C.
2.2.2. Chlorination0.5% bleaching powder solution was added to the preweighed PUC and agitated for 40–50 min at 60 °C. The cubes were then removed and dried in a hot air oven at 105–110 °C.