Specimensoffiveoftheimportedfishnamely:mackerel (Scomber.ScombrusStripedredmullet (Mullussurmuletus), Groster Argentine(Argentinasilus),Commenpandora(Pagelluseryihrinus) andAtlantichorsemackerel(Trachurustrachurus) (Table2) đã collectedfromafishmarketinAlexandriai nJanuary,2003.Selection ofsampleswasbasedonrelativeabundanceandavailabilitydueto thewidearrayofimportedspeciesandsourcesofsupply. Fromeach loài; eightfishwereobtained, packediniceandbroughttothe laboratoryonthesameday. Samplestissues, gillandliverofeach speciesweredissectedusingcleanequipmentandputseparatelyin petridishes'andtransferredintoanovensetto70°Ctodry.Drying continueduntilallthewettissuesreachedtoaconstantweight. Khô mẫu (triplicateeach0.4g) .wer eputintodigestionflasksfollowed byadditionof8mlnitricacid (Mejck), 3mlperchloricacidand heatedat80 ° G: untilallth ematerialswere, giải tán. Afterdigestion, sampleswerediluted, withdeioni ^ edwater, filteredandcompleted usingdeionizedwater * to25; ml. Theresultingsolutionswere analyzedusingflameatomic.absorptionspectrophotometer(AAS) (PerkinElmer, Model2380). Th eresultswereexpressedinmgkg"1 drywt. (UNEP/FAO/IAEA/IOC, 1984). Theabsorptionwavelength anddetectionlimitswereasfollows:228.8nmand0.06mgkg"1cho CD; 240.7nmand0.05mgkg"1forCo; 357.9nmand0.06mgkg"1 forCr; 324.7nmand0.06mgkg"1forCu; 248.3nmand0.8mgkg"1 forFe; 279.5nmand0.07mgkg"1forMn; 232.0nmand0, 09mgkg-1 forNi; 217.0nmand0.8mgkg"1forPb; 213.9nmand0.7mgkg"1 Fo rZn, tương ứng. Reagentsof
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