OP was observed to be degraded to about 90% in wet state
when exposed to sunlight. The photo-degradation was relatively
high in wet state as compare to dry state. The degradation rate
constant and half life for OP in wet state were 0.003583% min-
1 and 193.5 min, respectively. Whereas, the degradation rate
constant and half life for OP in dry state were 0.002488% min-1
and 278.6 min, respectively. The degradation pattern was linear