A solution of poly-Oxime (2 mg/ml) in 1% acetic acid was used to study its catalytic ability to cleave pesticides. The reactions were studied spectrophotometrically by monitoring the hydrolysis of pesticides (MPT, methyl paraoxon, or chlorpyrifos) at 25 ± 0.1°C and pH 8.2 by measuring the absorbance at 400 nm as a function of time. Pseudofirst-order rate constants were obtained by using an excess of nucleophile (2.5 × 10−4 M) over the substrate (2.5 × 10−5 M). For all the kinetic runs, the absorbance/time result fits very well to the first-order rate equation. To study temperature stability, the same reactions were carried out at 20°, 30°, and 40°C.

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