Levels of Trace Cadmium and Essential Zinc in Wheat flour Commercially Available in Addis Ababa, Ethiopia
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Date
2006-07
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Addis Ababa Universty
Abstract
Samples of wheat flour were collected from five different wheat flour processing
industries (DHGEDA, KOJJ, Akwan, Redfam, and Misrak.). Different digestion
procedures were tested by varying the type of reagent, temperature and time of digestion
to develop optimum digestion procedure. The optimal procedure required 4 hours and
consumed 6mL of 70% HNO3 and 2mL of 37% HCl to completely digest 10g of wheat
flour sample. The accuracy of optimal procedure was checked by digesting a mixture of
standard solutions and determining the percent recovery. The recoveries were 92% for Cd
and 94% for Zn. the concentrations of Cd and Zn in wheat flour samples were measured
by flame atomic absorption spectrophotometery employing a four point external
calibration curve. The mean concentration of Cd and Zn in wheat flour in this study
ranged (mg/kg DW) from 0.011 to 0.024 mg/kg and 5.93 to 9.88mg/kg respectively.
There was no significant difference observed in the levels of Cd and Zn in wheat flour
samples obtained from different industries. The wheat flour samples examined in this
study are non compliant with the maximum permissible concentration (MPC) for Cd in
wheat
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Keywords
Cadmium and Essential Zinc