Clearence Effect of Several Heteropoly Acid to the Hydroxyl Radicals

This paper adopted Spectrophotometry method and used Ascorbic acid as standard contrast,determined the clearence effect of three kinds of acid of Phosphotungstic acid(H〔3P(W3O10)4〕.xH2O),Phosphomolybdicacid(H〔3P(Mo3O10)4),Silicotungsticacid(H〔4S(i W3O10)4〕.xH2O)to hydroxyl radical(.OH).The results showed that the EC50 of Ascorbic acid was 57.68mmol/L,and the EC50 of Phosphotungstic acid,Phosphomolybdic acid,Silicotungstic acid were 10.43 mmol/L,11.08 mmol/L and 6.08 mmol/L,and all the three kinds of Heteropoly acid had a better clearence effect to hydroxyl radical(.OH)than strong oxidants Vc.Then the scavenging effect was Silicotungstic acid Phosphotungstic acid Phosphomolybdic acid.