A STUDY OF THE COMPARATIVE TOXICITY OF CRYOLITE FLUORINE AND SODIUM FLUORIDE FOR THE RAT

Abstract

A study of the toxicity of cryolite and of NaF was made. At the higher levels fed, less F was found in the skeleton when ingested as cryolite or as the sodium fluoride-aluminum chloride mixture than when ingested as straight NaF. When F was 0.06% of the diet, NaF was approximately twice as toxic as was cryolite or the sodium fluoride-aluminum chloride mixture. Four parts of F per million added to the drinking water as NaF or as cryolite resulted in identical storage of F in the bones of growing rats.