Document Type : Original Article
Authors
1
Pesticides Analysis Res. Div., Central Agric.
2
Pesticides Lab., Agric Res. Center. Dokki, Giza Egypt.
10.21608/jpces.2006.460747
Abstract
The persistence of methomyl, carbofuran and abamectin under different environmental conditions was studied. The compounds were divided into three groups (group 1: methomyl, group 2: carbofuran and group 3: abamectin), each group contain five formulations and technical from various sources (A, B, C, D and E). The present study was planned to study the following: Stability of active ingredient in the tested pesticides under direct sunlight, ultraviolet rays and storage on nude surface for four weeks in winter, two weeks in summer and accelerated storage in oven temperatures (14 days at 54 °C and 3 days at 72 °C). The physical properties for each unstored and stored pesticides were studied such as melting point, emulsion test, cold test, flash point. pH and alkalinity or acidity. Also, studied the chemical properties of the previous compounds by HPLC. The results obtained could be summarized as follows: Data showed that photodecomposition are positively correlated with exposure period. Also, the decomposition percentage of the tested pesticides, B, D, E from the tested groups 1-3, respectively showed higher rapid degradation than other tested pesticides. While tested pesticides D, C, C showed more stable than other tested pesticides when exposed to UV rays. Also, methomyl group showed more rapid degradation than other tested groups, while carbofuran group exhibited more stable than the other tested groups. The tested pesticides E, D, E from groups 1-3, respectively showed more rapid degradation than the other tested pesticides, while tested pesticides D, C, C showed more stable than the other tested pesticides. When exposed to direct sunlight. Also, the second tested group of pesticides showed more rapid degradation than other tested groups, while the first tested group showed more stable than other tested groups. The previous compounds when exposed to different kinds of storages uncovered surface and accelerated storage at different temperatures. The data showed that the physical and chemical properties for tested pesticides were not affected.
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