According to Figure 3.5, we can see the nutrient content of Mg, Cl, Ca, Mn, Na, K, Fe, Zn, Se were lower, not reaching 35% compared with the IOM and WHO standards, content Mn was very low (below 1%), the percentage content of the sample tuna Cu higher than other nutrients (87.56% in Ninh Thuan, 44.44% in Da Lat, Nha Trang 47.76%). Hg concentrations in samples poison tuna at three sites was low (25.37% in Nha Trang, Dalat 22:39%, 16.92% in Ninh Thuan), concentrations of arsenic in samples of tuna in Ninh Thuan and Nha Trang are lower WHO standards (68.73% and 81.5% in Ninh Thuan in Nha Trang). Meanwhile concentrations in tuna As in Dalat, exceeded WHO standards is 100.92%.
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