Rock Salt: A Probable Dietary Source of Fluoride

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Abstract
The F contents of many samples of salt were found to range from 10 to 20 ppm [parts per million]. However, all "rock-salt" samples contained significantly more F. Four samples contained 40 to 50 ppm and one sample 170 ppm (228 ppm corrected for NaCl content). If, in consideration of the extreme tropical climate of Punjab, we accept a daily intake of 20 of NaCl as rock-salt (200 ppm fluoride), the daily ingestion of fluoride could amount to as much as 4 mg over and above that ingested through drinking water and other dietary sources. This could partly explain the reports of skeletal fluorosis in certain regions in Punjab, with relatively low levels of F in drinking water, not known to be associated with skeletal fluorosis in other parts of the world.

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