Comparative analysis of the level of lead and cadmium contamination of food during processing with atlas machine and a local grinding stone 

By Wyasu  G. , Onoja  E., and Omeiza, F.S. 
 
ABSTRACT

The following food samples; maize, Sorghum, Soya-beans, Beans and  Millet were analyzed to determine the level of lead (Pb) and cadmium (Cd) after the food samples were  processed with milling engine and   the local grinding stone. The food samples were digested with concentrated solution of HNO3, H2SO4 and HCIO4. Atomic absorption spectrophometry (AAS) analysis  of the digested food samples were carried out to determine the trace metal ( lead and cadmium). On comparison of the results obtained from the samples processed by the milling engine, and that processed by the local grinding stone, it was found out that the food samples processed by the milling engine had 0.250ppm of Pb and 0.030ppm of Cd: 0.210ppm of Pb and 0.030ppm of Cd: 0.188ppm of Pb and 0.028ppm of Cd: 0.225ppm of Pb and 0.026ppm of Cd: 0.200ppm of Pb and .031ppm for maize, sorghum soybeans, beans and millet respectively; while the level of contamination from local grinding stone are 0.130ppm of Pb and 0.021ppm of Cd: 0.120ppm of Pb and 0.019ppm of Cd: 0.138ppm of Pb and 0.027ppm of Cd: 0.147ppm of Pb and 0.024ppm of Cd: 0.156ppm Pb and 0.026ppm of Cd   for maize, sorghum soybeans, beans and millet respectively. 

Key Words: Heavy metals, grinding stone, Atlas machine, Food samples.

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