Abstract
Copper and lead contents of food additives are determined by polarography. These metals are extracted with 0.05% dithizone-CCl4 and re-extracted with 6N HCl. It is possible to determine both metals on one polarogram. It requires 2.5 hours when ignition is abridged for water soluble materials. The recovery of added copper and lead for several food additives is in the range of 95-110%, and it is possible to determine to 0.1 p. p. m. level.
Copper and lead contents of food additives in this experiments are under the critical levels.
