الفهرس 
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Abstract
Twenty-s ven different pesticide residues were investigated in a
variety of water. sediment and soil samples collected from three different locations at Kalubia governorate during two periods in 1999-
2000.
The obtained results showed that most of the analyzed water, sediment and soil samples contained different residue levels of pesticides, according to sampling location and the time during which the samples were examined. Organochlorine pesticides were the main contaminants of sediment and soil samples, while some samples contained traces of other pesticides. Water, sediment and soil were contaminated with organophosphorous, pyrethroid and organochlorine pesticides.
An experiment was conducted to estimate the to.s of effects of
hardness and temperature on some pesticides: chlorpyrifos-ethyl (organophosphorous pesticide), fenpropathrin (pyrethroid) and P,P DDT (organochlorines pesticide).