THE ROLE OF METAL (HYDR) OXIDES IN CATALYZING THE HYDROLYSIS OF QUINALPHOS

Catalysis of the hydrolysis organ phosphorus compound, quinalphos (Q) by (hydr) oxides was studied at pH 4.0, 7.0, and 10.0, 25oC. FeOOH Al(OH)3 were used solids for this research. followed determining disappearance Q appearance 2-hydroxyquinoxaline (HQ) product in absence presence using HPLC with UV detector. Under these conditions, both hydroxides (FeOOH Al(OH)3) have catalyzed quinalphos. In study, found to be best catalyst pHs. It is apparent that Kobs almost equal HQ, which indicates 10.0 follows SN2 (P) pathway. On other hand, 4.0 may two pathways, (C), as producing HQ smaller than loss Q.