Seasonal Distribution of Pesticides and Metals Residues in Water Bodies Collected From Different Locations of Kalubia
Governorate, Egypt
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The pesticide residues in drainage water, ground water and sediment samples collected from different locations through four different seasons at Kalubia governortae were monitored within July, 1999 till June 2000. In the drainage water, it was noticed the dominance of organochlorine insecticides among the monitored compounds. Samples location and season proved important role on the frequency and occurrence of pesticides residues. As example, El-Esmailia water analysis showed that p,p’-DDT was detected in 0.204 ppb as average of the four seasons, i.e., Summer, Autumn, Winter and Spring, while the other chlorinated hydrocarbons were found in lower levels, from 0.06 (Heptachlor) to 3.55 (b-HCH). Benefin was found at 13.2 ppb., while the OP’s parathion existed in 44.08 ppb in spite of its banning since 1990 in Egypt. The pyrethroid fenpropathrin was found at 2.51 ppb, and followed by alpha-methrin 1.93 ppb. The obtained results indicated the existence of high levels of a-HCH in ground water from El-Esmailia (405.3 ppb, Autumn), aldrin (25.9 ppb, Spring), p,p’-DDE (44.0 ppb, Summer), fenitrothion (300.7 ppb, Spring), parathion (13.3 ppb, Summer). Sediment samples were found containing high levels of pesticides but in various levels due to the location and season. Sediment from El-Esmailia was found containing total a-HCH (47.7 ppb), b-HCH (891.6 ppb ), Benefin (910 ppb ), fenpropathrin (242 ppb ) and Thiram (107.6 ppb). The obtained results indicate the negligible existence of metals in drainage and/or ground water i.e. Co, Ni, Cr and Pb. Mn was the only exception which exhibited the high amounts in water samples at the three selected sites.