Investigation of Released Cadmium and Lead from Different Colors of Over Glaze Designs to Food Stuff in Different Conditions


Department of Chemistry, Damghan Branch, Islamic Azad University, P. O. Box 36716-39998, Damghan, Iran


In this paper, leaching of lead and cadmium was investigated from porcelain over glaze designs between different colors.  Also the effect of microwave heating was considered on leaching of lead and cadmium.  Dishes were selected with a decor with the dominant color of gray, red, yellow, blue, and dark blue. Amounts of cadmium and lead which leached from the container by acetic acid and orange juice were measured according to the standard ASTM C738.  The results showed that especially in the red and dark blue colors cadmium and lead could be released easily by either acetic acid or orange juice, and these amounts were much higher than the permissible standard amount. Also microwave heating could enhance releasing of lead and cadmium from decorated dinnerware. 


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