ADSORPTION AND HYDROLYSIS OF METHYL PARAT HION (MPT) ON ACTIVATED CARBON AND ADSORPTION RESIN

Investigating adsorption of methyl parathion on the activated carbons Filtrasorb 400 and F 44 and on the adsorption polymer Wofatit Y 77 we found a stronger adsorption on the carbons at smaller concentration wh ereas the resin has the larger capacity at higher concentration. Adsor bents were regenerated through hydrolysis of the pesticide at pH = 11. 7. The velocity of hydrolysis in the adsorbed state is reduced to a te nth of that in solution. However, a transport resistance in the pores of adsorbents seems to be negligible as may be concluded from the very small measured particle diameter dependence of the velocity constants . In adsorption-regeneration measurements the capacity of the adsorben ts stabilized at about 70% of that of the fresh adsorbents.