There has been growing interest in determining heavy metal levels in the marine environment and attention was drawn to the measurement of contamination levels in food supplies, particularly fish [7-10]. Heavy metals can be classified as potentially toxic (aluminium, arsenic, cadmium, lead, mercury), probably essential (nickel, vanadium, cobalt) and essential (copper, zinc, selenium) [11]. Toxic elements can be very harmful, even at low concentration, when ingested over a long time period.
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