MONITORING OF PESTICIDE RESIDUES IN RIVER NILE WATER FROM EGYPT BY SOLID-PHASE EXTRACTION FOLLOWED BY GAS CHROMATOGRAPHY AND GAS CHROMATOGRAPHY–MASS SPECTROSCOPY
Ali, H., Osman, M., Potter, T., Mohamed, M. (2005). MONITORING OF PESTICIDE RESIDUES IN RIVER NILE WATER FROM EGYPT BY SOLID-PHASE EXTRACTION FOLLOWED BY GAS CHROMATOGRAPHY AND GAS CHROMATOGRAPHY–MASS SPECTROSCOPY. EKB Journal Management System, 13(2), 187-196. doi: 10.21608/ajs.2005.15335
Hanaa F.M Ali; M A Osman; T L Potter; M A Mohamed. "MONITORING OF PESTICIDE RESIDUES IN RIVER NILE WATER FROM EGYPT BY SOLID-PHASE EXTRACTION FOLLOWED BY GAS CHROMATOGRAPHY AND GAS CHROMATOGRAPHY–MASS SPECTROSCOPY". EKB Journal Management System, 13, 2, 2005, 187-196. doi: 10.21608/ajs.2005.15335
Ali, H., Osman, M., Potter, T., Mohamed, M. (2005). 'MONITORING OF PESTICIDE RESIDUES IN RIVER NILE WATER FROM EGYPT BY SOLID-PHASE EXTRACTION FOLLOWED BY GAS CHROMATOGRAPHY AND GAS CHROMATOGRAPHY–MASS SPECTROSCOPY', EKB Journal Management System, 13(2), pp. 187-196. doi: 10.21608/ajs.2005.15335
Ali, H., Osman, M., Potter, T., Mohamed, M. MONITORING OF PESTICIDE RESIDUES IN RIVER NILE WATER FROM EGYPT BY SOLID-PHASE EXTRACTION FOLLOWED BY GAS CHROMATOGRAPHY AND GAS CHROMATOGRAPHY–MASS SPECTROSCOPY. EKB Journal Management System, 2005; 13(2): 187-196. doi: 10.21608/ajs.2005.15335

MONITORING OF PESTICIDE RESIDUES IN RIVER NILE WATER FROM EGYPT BY SOLID-PHASE EXTRACTION FOLLOWED BY GAS CHROMATOGRAPHY AND GAS CHROMATOGRAPHY–MASS SPECTROSCOPY

Arab Universities Journal of Agricultural Sciences
Article 1, Volume 13, Issue 2, September 2005, Page 187-196  XML PDF (492.57 K)
Document Type: Original Article
DOI: 10.21608/ajs.2005.15335
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Authors
Hanaa F.M Ali* 1; M A Osman1; T L Potter2; M A Mohamed1
1Biochemistry Department, Agriculture Faculty, Cairo University, Giza, Egypt
2USDA, Agricultural Research Service, Tifton, GA, USA
Abstract
Solid-phase extraction (SPE), gas chromatography electron capture detector (GC-ECD) and gas chromatography nitrogen-phosphorous detector (GC-NPD) and gas chromatography–mass spectroscopy (GC-MS) were applied for trace-level de-termination of 20 pesticides in river nile water. Samples were collected from March to October 2003 from different sites located in Greater Cairo, Egypt. First, extrac-tion by on-site solid-phase extraction of 1 liter from field and laboratory spiked and unspiked (raw river water) samples using poly-divinyl benzene-N-vinyl pyrolidine cartridge based sorbent. Next, water extracts were subject of analysis by GC-ECD and GC-NPD. Next, selected samples that were positive to GC-ECD or GC-NPD were analyzed by GC-MS in order to improve the determination of detected pesti-cides. Recoveries from laboratoy spiked samples were > 85% for 16 of the 20 com-pounds with % relative standard deviation (% RSD) in the 5 to 10 % range. The lowest recoveries were for aldrin, 52 % and prothiofos, 48 %. A similar trend was observed with p,p-DDE and p,p-DDT values. Field spike results also indicated high % recovery for most of the target compounds. Values were > 85% for 12 of the 20 analytes, as was the case in laboratory spikes, Aldrin, 54 % and prothiofos, 55 % yielded the lowest values. Overall field spike recovery reproducibility was lower since % RSDs were higher, 15-40 %. Overall results indicated a relatively high de-gree of accuracy and precision could be achieved for most of the target compounds by methods applied in present study.
Keywords
Solid-phase extraction; Pesticides residues; Gas chromatography; Mass Spectroscopy
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