CINÉTICA DE LA HIDRÓLISIS DEL METILPARATIÓN EN MEDIO ACUOSO

The kinetics of alkaline hydrolysis of methylparathion was studied at different temperatures (O-50%) in the pH range of 8-12 by ultraviolet-visible absorption spectroscopy. Optimum pH and wavelenght conditions were defined to carry out the simultaneous determination of methylparathion and one of its hydrolysis product, paranitrophenol, in buffered aqueous madium. Based on the experimental data and the mathematical equation of the kinetics, a rate constant (k) of firsts-order and an activation energy (Ea) of 9.2 kcal/mol, were estimated.