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Lead(II) chromate can be produced by treating sodium chromate with lead salts such as lead(II) nitrate or by combining lead(II) oxide with chromic acid. Related lead sulfochromate pigments are produced by the replacement of some chromate by sulfate, resulting in a mixed lead-chromate-sulfate compositions Pb(CrO 4) 1−x (SO 4) x. This ...
Nevertheless, a Canadian company, Dominion Colour Corporation, is "the largest manufacturer of lead-based paint pigments in the world" and has faced public criticism for obtaining permission from the European Chemicals Agency to continue to export lead chromate paints from its Dutch subsidiary to countries where its uses are not tightly regulated.
Chrome yellow or crocoite (PY34): lead chromate (PbCrO 4). Cobalt pigments. Aureolin or cobalt yellow (PY40): potassium cobaltinitrite (K 3 Co(NO 2) 6). Iron pigments. Yellow ochre (PY43): a naturally occurring clay of monohydrated ferric oxide (Fe 2 O 3 ·H 2 O). Lead pigments. Naples yellow (PY41). Lead-tin-yellow: PbSnO 4 or Pb(Sn,Si)O 3 ...
That’s because the lead-to-chromium ratio in the applesauce was consistent with that of a chemical compound called lead chromate, which contains both lead and chromium-6.
Later the FDA confirmed the lead and chromium were from lead chromate — an inorganic compound that, historically, has been illegally added to certain spices to increase their weight and enhance ...
The company sourced cinnamon manufactured in Ecuador that was tainted with lead chromate, an additive that seeks to brighten the spice. There were at least 500 cases across the U.S. of children ...
Phoenicochroite is a basic lead chromate, Pb 2 CrO 5 with dark red crystals, and vauquelinite a lead and copper phosphate-chromate, Pb 2 CuCrO 4 PO 4 OH, with brown or green monoclinic crystals. Vauquelinite was named after Louis Nicolas Vauquelin , who in 1797 discovered (simultaneously with and independently of M. H. Klaproth) the element ...
Both insoluble salts of lead and barium chromates as well as soluble chromates were negative in the implantation model of lung carcinogenesis. [11] Yet, soluble chromates are a confirmed carcinogen so it would be prudent to consider all chromates carcinogenic. [9] [11] The LD50 of lead chromate is 5 g/kg (oral, rats). This low toxicity is ...