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. test, 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". test, 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', test, 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. test, 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, Pages 187-196    PDF (492.57 K)
Document Type: Original Article
DOI: 10.21608/ajs.2005.15335
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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