EFFECT OF UV/H2O2 ON OXIDATION PERFORMANCE OF AS( Ⅲ) IN SOIL

The paper oxidized As( Ⅲ) to As( Ⅴ) in soil to make it easy to be solidified，minimizing its migration and toxicity．Nature light，UV，H2O2 ，nature light + H2O2 and UV + H2O2 were used as the oxidizing agents applying to simulating polluting soil． The results showed that all of them could oxidize As( Ⅲ) and UV + H2O2 had the best performance． Orthogonal test was carried out to get the optimum oxidizing conditions． The results showed that: UVC was best efficient; when the light intensity of 12 W and exposure time of 6 h，the oxidizing result was fine; the degree of oxidation didn' t improve with the increase of the light intensity and exposure time; H2O2 dosage of 20 mL/kg could reach an ideal effect and the degree of oxidation increased with the dosage of H2O2 ．