Effect of storage on the stability on some organophosphorus formulation and their impurities

Abstract EN

The present work was carried out to study the persistence of somathion Kz 50% (W/v) EC ( Fenitrothion) and malatoxs 57 %(W/V) EC (Malathion ) under storage at 54 ºC for 28 days.

The stability of fenitrothion and malathion active ingredient were 50.43 and 57.17 % before storage for all fenitrothion and malathion become after storage at the end of experiment 39.52 and 36.56% for 28 days storage respectively.

The impurities of fenitrothion 50 % EC before storage were UND S-methyl fenitrothion , TMP Tetramethyl pyrophosphorothioat and water become after storage 1.17 % , UND and UND after 28 days from storage at 54 ºC respectively .

Also, malathion 57 % EC before storage meooops, mooSPs, malaxoin and isomalathion after storage 0.75 , 0.217 , UND and 2.89 % respectively.

Fenitrothion and malathion degradation after 28 days product S –methyl Fenitrothion and O,O S triethyl ester , malathion product isomalathion.