Using of locally prepared non-ionic surfactants as emulsifiers for reworking thephysically deteriorated pesticide vapathion 57% EC

摘要

This study aims to use the locally prepared surface active agents materials from locally raw materials and products as emulsifier for reworking the physically deteriorated pesticides, resulting in utilization of obsolete pesticides. 1- To use the prepared surface active agents materials as emulsifier for reworking the physically deteriorated pesticide: vapathion 57% EC. The solubility of prepared surfactants in pesticides at different concentration was tested then emulsion stability test was tested for solublized surfactant in vapathion. The physicochemical properties were assessed to mixture successful in emulsion stability test such as the free acidity or alkalinity, the cold and accelerated storage. 2- The physicochemical properties of spray solution were studied for vapathion alone and mixed with surfactants to physically compatible mixtures and also for successful mixing materials for reworking the pesticide vapathion 57% EC which were: surface tension, pH, conductivity and viscosity. 3- The pesticidal efficiency was evaluated against the cotton leafworm according the Protocol of the Ministry of Agriculture to vapathion with completely dose plus the surface active agents materials in case of use as improved materials and the pesticide vapathion at before and after reworking with complete rate. Results obtained showed that, all prepared non-ionic surfactants successful for reworking the physically deteriorated pesticide at concentration 2%. The results also obtained that the tested nonionic surfactants which were: DEGML, GML and GMS successful for improving physicochemical properties of spray solution of deteriorated pesticides which were surface tension, viscosity, conductivity and pH value. The bioassay indicated that DEGML gave the highest increase in average residual effect used as emulsifier for reworking the pesticide vapathion at 100% of the dose.