Reaction of Potassium Peroxodisulfate with Water under UV Irradiation

抄録

Potassium peroxodisulfate (5 g/dm³) reacted readily with water by UV irradiation (30 W mercury arc tube) even at room temperature. The reaction rate constant was estimated to be 3.5×10⁻³ S^−l from the relationship between irradiation time and logarithm of concentration of remaining potassium peroxodisulfate. The volume of oxygen produced by the reaction was well accordance with the stoichiometric value. The oxidation of ammonia (2.00 mg N/dm³) in water into nitrate ion also proceeded in 5 minutes at room temperature if UV irradiation was made to the solution in the presence of NH₃.