Document Type : Research Paper
Authors
1 Department of Environmental Sciences & Engineering, Faculty of Agriculture & Natural Resources, Ardakan University, Ardakan, Iran.
2 Department of Environment, Faculty of Natural Resources, University of Zabol, Sistan and Baluchestan, Zabol
Abstract
The purpose of this research is to evaluate the risk of metals (lead, chromium, mercury, arsenic and nickel) on the health of children and adults through the consumption of Nile tilapia fish raised in the bioflac breeding system. The number of 30pieces of tilapia fish grown in the bioflocsystem was caught and analyzed by an atomic absorption . The average concentration of metals, the daily intake(DI) of metals through the frequency of consumption of tilapia fish for different groups, the risk index(HQ), the number of allowed servings of tilapia fish per month(CRmm) was calculated for people in different groups. The highest and lowest daily absorption rates in the adult group are related to arsenic elements (2.08 x 10-3µg/kg/d) and mercury(2.49 x 10-6 g/kg/d) in the children group, respectively In the case of lead(4.93×10-5µg/kg/d) and mercury(3.28×10-9 µg/kg/d). The hazard index(HQ)for both study groups was lower than one in all elements. The HI rate was 0.83 for adults and 0.02 for children, which was lower than one. For adults, the HI index was close to 1, which according to the HQ values of each element, the greatest increase in the HI value can be due to the higher HQ value for arsenic(0.695)
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