Publication: Determination of heavy metals in edible parts of catfish using flame atomic absorption spectroscopy (faas)
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Date
2019-01
Authors
Ibrahim, Nursaibah Syahidah
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Abstract
The aim of this study is to determine the concentration level of heavy metals (Zn, Cu, Cd, and Pb) in edible parts of catfish using Flame Atomic Absorption Spectroscopy (FAAS). The level of these metals in farm-raised consume (pellets and animal matters) and wild-caught catfish, purchased from two aquaculture ponds (farm-raised) and one market (wild) at Terengganu and Kelantan were analyzed. The conventional wet acid digestion method was used • for the mineralization of these samples prior to the quantitative determination by Flame Atomic Absorption Spectroscopy (FAAS). The heavy metal concentration in the farm-raised catfish that consume pellets ranged from (2.652 ± 0.1593 to 3.460 ± 0.1652 mg/kg) for Cu and (13.419 ± 0.2614 to 21.486 ± 0.3305 mg/kg) for Zn. Meanwhile, the concentrations of heavy metals in fann-raised catfish which consume animal matters were ranged from (0.367 ± 0.1469 to 0.846 ± 0.291 mg/kg) for Cu and (11.787 ± 0.1967 to 26.204 ± 0.4472 mg/kg) for Zn. The concentrations of heavy metal in wild catfish were ranged from (2.007 ± 0.1150 to 4.821 ± 0.1661) for Cu and (9.392 ± 0.5142 to 12.894 ± 0.2877 mg/kg) for Zn. However, for Cd and Pb concentrations in all catfish in this study found to be below than detection limit. The concentrations of heavy metals in these catfish were compared with pennissible limit stipulated by WHO/FEPA. The copper contents in one of the farm-raised catfish that consume pellets and one of the wild catfish were higher than permissible limit. Therefore, the consumers should aware of the food poisoning arose upon consuming these catfish. The average heavy metal contents in both (fann-raised that consume pellets and animal matters) and wild catfish were arranged in the order; either Zn > Cu > Pb > Cd or Zn >Cu > Cd > Pb. It was concluded that heavy metals concentration level in catfish must be monitored comprehensively and periodically with respect to human health.