The pesticide parathion is applied to a field on a sunny day. Parathion reacts via photolysis (sunlight), with water (hydrolysis) and by oxidation. These reactions occur simultaneously. How long does it take for the concentration to reach 5% of the original concentration? The pseudo-first order kinetic rate constants are:
kp =0.10 day-1, kh =0.028 day-1, ko =0.005 day-1