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Received December 19, 1991,Revised , Accepted , Available online

Volume 4,1992,Pages 10-16

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The degradation of the insect growth regulator 1-(2-chlorobenzoyl)-3-(4-chlorophenyl)urea (CCU)was studied both in distilled water and in buffer solution.The experimental results indicated that CCU is not stable in aqueous solution and easily decomposes in alkaline water.At pH 6 and pH 10,the half lives (Tv2)of hydrolysis arc about 9 days and 2 days,respectively.The rate of hydrolysis increases as either the concentration of alkalinity or temperature increases.At [NaOH]=0.01865 mol/L,with every lOoC increase in temperature,the reaction rate increases about 3 times.the activation energy for hydrolysis is 7l.56 kJ/mol.Basic catalyzed degradation of CCU at levels greatly above its solubility in water resulted in rapid degradation to as many as four identified products:(4-chlorophenyl)urea,2-chlorobenzoic acid,2-chlorobenzamide,and 4-chloroaniline.The major products were(4-chlorophenyl)urea and 2-chlorobenzoic acid.

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