STUDIES ON BEHAVIORS OF DECOMPOSITION OF PESTICIDES IN ENVIRONMENT

In order to know behaviors of pesticides in the environment, changes i n residual patterns of 35 organophosphorus, 28 organonitrogen, 9 organ ochlorine and 7 pyrethroid pesticides after boiling and heating, and b y alterations in pH were investigated. A high correlation between the solubility of water and the residual percentage of pesticides 30 min a fter boiling at 100 degrees C was recognized, and a similar relation w as also detected between the vapor pressure and the residual percentag e of pesticides 30 min after heating. With an alteration in pH, it is suggested that formotion, chinomethionat, bendiocarb, cypermethrin, fl uvalinate and fenvalerate were hydrolyzed in alkaline conditions. And also carbosulfan and amitraz were hydrolyzed in acidic conditions. But 71 in 79 kinds of pesticides did not decompose from pH 6 to 10. It wa s identified by GC-MS that carbosulfan was decomposed into carbofuran by the acidic hydrolysis.