オゾンによるAs (III) の酸化反応速度

抄録

The oxidation of arsenious acid with ozone in aqueous solutions and sulfuric acid solutions was investigated. In this work, six variables were considered as those affecting the rate of oxidation:(1) rotation speed, (2) initial arsenious acid concent- ration, (3) arsenic acid concentration, (4) partial pressure of ozone, (5) pH and (6) temperature. The rate of oxidation with ozone was also determined in sulfuric acid solutions, up to 14.7 M H₂SO₄. Zero order kinetics with respect to arseniousacid arsenic acid concentrations and first order kinetics with respect to partial pressure of ozone were observed. Gaseous ozonedissolves rapidly in the aqueous solution and the equilibreem between gas and liquid is established, so that the rate of oxidation given by Ozone acts as a strong oxidant for arsenious acid below 7 M H₂SO₄