assessment of environmental toxic trace metals and pesticides contents in selected fish species from guiers lake by using xrf and gc/ecd techniques

the most used quechers and gas chromatography methods were performed, to evaluate the presence of organochlorines, organophosphate, polychlorinated biphenyl and chlorobenzenes in water and in fish. according to the standard iso iec 17025, a recovery rate obtained ranged from 70 to 120% assessing the reliability of analysis results. the exceed rate in fish of malathion is 22.2, and 5.2 ppm in sampling site xgl411 and xgl416 respectively, endrin is 4 ppm in xgl415, trifluralin and parathion is 1.6, 1.4, 1.8 and 4.2 ppm in xgl413, xgl414, xgl415 and xgl417 respectively and pyrimiphos-methyl is 1ppm in xgl417. in water, the exceed rate of trifluralin is 6.5ppb in xgl411 and parathion and pyrimiphos methyl is 1.1, 1.8, 1, 1, 1.5 ppb in xgl412, xgl413, xgl414, xgl415 and xgl420 respectively. the purpose of this work is to assess a chemical analysis related to screening pesticides and potentially toxic metal in water and fish samples taken from guiers lake. the estimating level of contamination in fish muscles has been performed using x-ray fluorescence technique and the level of cadmium have to be monitored due to the potential effects on the fish themselves and the organism that consume them.