الفهرس 
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Abstract
The present study was carried out to estimate the concentration of mercury and lead in different brands of canned tuna fish marketed in Assiut City by using Atomic Absorption Spectrophotometer.
A total 90 tuna cans from 5 commercial brands in each brand three types (solid, chunks and shredded) imported from Thailand; most of them from skipjack tuna species which were caught from gulf of Thailand; were collected from large supermarkets in Assiut City.
The results of this study showed that 41 samples with a percentage 45.5 % from total 90 samples were contain mercury in different concentration ranged from 0.14 to 1.28 with mean 0.28 ppm, from these 41 positive samples there were 25 samples with a percentage 27.7% above the maximum limit of mercury in fish (0.5) ppm.
Regarding lead, 29 samples with a percentage 32.2% from 90 examined samples were contain varied concentration of lead ranged from 0.11 to 1.018 with mean 0.14 ppm and from these 29 samples, there were 20 with a percentage 22.2% above the maximum limit of lead in fish (0.3) ppm according to Egyptian standard specifications (2010), but for FAO (0.1) there were 28 samples with a percentage 31.1%.