Journal of Agriculture and Ecology Research International

The aim of this study has investigated the degradation of diazinox 5% and five different concentration of diazinon (diazinon 95%, diazinon 15%, diazole 50%, diazit 60% and octadat 60%) before and after storage at 54 +2°C for 0, 7, 14 days. Besides, the effects of storage on the formation of its toxic impurities (sulfotep, monothiono-tepp, and water) were studied. The data showed that diazinox 5%, was less stable than different concentrations of diazinon, whereas the percentage loss 38.5% while, diazinon 95% was more stable for storage which has percentage loss is 1.14% after 14 days of storage at 54+2^oC. For results, diazinon 15%, diazole 50%, diazit 60% and octadat 60% show it’s relatively moderate in its stability compared with other tests which have a percentage loss ranged from 1.33 to 27.2% after 14 days of storage at the same conditions.

Moreover, the monothiono-tepp impurity (O, S- TEPP) in diazinon 95%, diazinox 5% and diazit 60% was more than the maximum permissible concentration of impurity recommended by FAO specifications before and after storage. But diazinon 15%, diazole 50% and octadat 60% was This level are allowed to limit according to FAO before and after storage. While sulfotep impurity in diazinon 95% was more than the maximum permissible concentration of impurity recommended by FAO specifications before and after storage. On the other hand, diazinon 15%, diazinox 5%, diazole 50%, diazit 60% and octadat 60% were This levels are allowed to limit according to FAO before and after storage. 

Finally, GC – MS analysis gives the same separation before storage whereas it gives a new separation peak after storage and results showed that of the breakdown of the 2-Isopropyl-6-methyl-pyrimidin-4-ol main product in diazinon and diazinox. Also, IR analysis showed that the % match of all tested was more than 90 before and after storage.