The concentration of organophosphorus pesticides in fish samples from different tributaries of the Nile River in Egypt was monitored. Fish samples were collected from El Menofiya, canal water supplies (El-Sarsawia, El-Bagoria and Bahr Shebin), in addition to El-Embaby, El-Menofi and Miet Rabiha drainage canals each 2 month during periods of 16 month, June 2007-Septemper 2008. Chloropyrifos, cadusafos, diazinon, prothiphos and malathion were detected in fish tissues samples at level below the maximum residue limit. The highest average amount of chlorpyrifos (9.38 ng g(-1)) and malathion (8.31 ng g(-1)) were detected in El-Embaby drain. Prothiphos were found in tissues collected from El-Sarsawia canal and Miet-Rabiha drain at mean concentration of 4.91 and 6.55 ng g(-1), respectively. Diazinon was only found in one fish sample that collected from El-Menofi drain at the level of 9.23 ng g(-1).

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This research aims at determining residues of thiophanate methyl and propiconazole in grape and mango fruits as an indication for their persistence in this environmental compartment. Fruit extracts were analyzed for thiophanate methyl using High Performance Liquid Chromatography and using Gas Chromatography Electron Capture Detector (GC/ECD), respectively. The results indicated that propiconazole had a less environmental impact since propiconazole had shorter residue half-lives which were 1.24 and 1.19 days in grape and mango fruits, respectively, while thiophanate methyl had half-lives of 2.49 and 2.64 days in mango and grape, respectively. The degradation rates of propiconazole in grape and mango fruits did not change significantly and neither did those of thiophanate methyl. According to the maximum residue level, the pre-harvest intervals of propiconazole were set to be 3 and 7 days for grape and mango fruits, respectively, and the pre-harvest intervals for thiophanate methyl were 15 days for both grape and mango fruits. Propiconazole was generally considered to be less hazardous to humans and will leave the environment less altered because of its faster degradation than that of thiophanate methyl.

The objective of this study was to evaluate the levels of Zn, Cu, Pb, Fe and Cd metals in water samples collected from different tributaries of the Nile River in Egypt. Samples were taken from El-Sarsawia, El-Bagoria, Bahr Shebin canals, in addition to three drainage canal sites El-Embaby, El-Menofi and Miet-Rabiha drain. According to the data, Fe has the highest concentration, followed by Pb, Zn, Cd and Cu. The mean Pb concentration ranged from 8.678 to 21.948 μg/L, in water samples collected from El-Sarsawia canal and El-Embaby drain, respectively. The Cu and Cd mean concentrations ranged from 0.67 and 0.500 to 4.908 and 5.650 μg/L, respectively, in water samples collected from Bahr-Shebin canal and El-Embaby drain, respectively. The water samples from all location sites are polluted by Pb according to EPA. Fe and Cu values are within the allowable limits.

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Supervised field trial was conducted to study the dissipation rates of two widely used acaricides hexythiazox (Makoyt 10%WP) and abamectin (Veractin 25 % EC) on strawberry under Egyptian climatic condition. Samples were collected randomly at successive intervals after pesticides spraying at recommended rate of applications. The samples were extracted and cleaned up using QuEChERS method and quantified by HPLC-equipped with Diode-Array Detector (DAD). The LOD&LOQ of hexythiazox and abamectin were 0.01mg/kg and 0.03mg/kg, respectively.The recovery of the tested pesticides was 90%and 81 %.The results showed that, the initial deposits were 3.64 and 1.31mg/kg and the calculated half-life's (t½) were 2 and 1.5 days in strawberry for hexythiazox and abamectin, respectively. However, Pre harvest intervals (PHI) on strawberry were 4 and 7 days for hexythiazox and abamectin, respectively