METALS CONTENT IN THE MUSCLE AND HEAD OF COMMON FISH AND SHRIMP FROM RIYADH MARKET AND ASSESSMENT OF THE DAILY INTAKE

Three highly consumed fish including nile tilapia (oreochromis niloticus), gray mullet (mugil cephalus) and california sardine (sardinops sagax) and black tiger shrimp (penaeus monodon) in riyadh market, saudi arabia were evaluated for their composition of arsenic, cadmium, chromium, nickel, lead, copper, zinc, and manganese metals. the concentration of metals was determined in the muscle and the head of fish and shrimp using atomic absorption spectrophotometry (aa). the maximum metals in the samples were found in the head of shrimp and sardine. the maximum as, cd, cr, ni, pb, cu, zn, and mn concentrations in fish muscles were 0.033, 0.369, 0.007, 0.012, 0.005, 0.76, 6.28 and 0.26 μg/g respectively. meanwhile, zinc and copper were the highest in shrimp muscle. the concentration of metals was below the maximum allowed daily intake limit by the saudi and international legislations for fish human consumption permissible limit. the calculated maximum daily intakes (mdi) were found to be 0.055, 0.613, 0.012, 0.020, 0.008, 1.262, 10.432 and 0.432 μg/day for as, cd, cr, ni, pb, cu, zn, and mn in fish muscle respectively. while the mdis' of those metals in shrimp muscle were 0.382, 0.728, 0.050, 0.033, 0.013, 3.588, 22.525 and 0.432 μg/day.