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Determination of Trace Metal Contaminants in Edible Salts in Tehran (Iran) by Atomic Absorption Spectrophotometry

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Author(s): Gholam Reza Jahed Khaniki | Mohammad Hadi Dehghani | Amir Hossein Mahvi | Shahrokh Nazmara

Journal: Journal of Biological Sciences
ISSN 1727-3048

Volume: 7;
Issue: 5;
Start page: 811;
Date: 2007;
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Keywords: edible salts | kitchen salt | table salt | contaminants | Trace metals | atomic absorption spectrophotometry

ABSTRACT
In this research the concentration of some trace elements such as Pb, Cd, Zn, Fe, Cu and Al in edible salts were determined. The study was carried out on 60 samples of kitchen salts and table salts (a fine-ground, refined and crystallized rock salt with nearly pure 95% or greater sodium chloride). The packed salt samples were collected from retail market in Tehran City and analyzed by flame atomic absorption spectrophotometry for Lead (Pb), Cadmium (Cd), Zinc (Zn), Iron (Fe), Copper (Cu) and Aluminum (Al). The mean and standard deviation of Pb, Cd, Zn, Fe, Cu and Al in kitchen salts were 1.59±0.90, 0.91±0.32, 6.02±2.54, 17.8±6.11, 1.24±0.90 and 5.82±0.61 mg kg-1, respectively. Also, the mean and standard deviation of Pb, Cd, Zn, Fe, Cu and Al in table salts were 0.86±0.52, 0.65±0.34, 6.5±4.86, 15.3±5.95, 1.21±0.79 and 5.60±0.75 mg kg-1, respectively. It was concluded that the levels of some toxic metals in some investigated Iranian packed edible salts were exceeded the maximum allowable concentrations of metals recommended by the Codex Alimentarius Commission and Iranian Institute of Standards and Industrial Research.

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