Inhibition of oral lead absorption in rats by phosphate-containing products

Recent studies indicate that elevated blood lead levels in children are largely a result of exposure to this metal via the oral route. A logical approach to decrease or prevent lead intoxication would be to reduce its absorption as soon as lead ingestion is known or suspected. Presently, however, there are no readily available products recommended to accomplish this goal. It was found that a phosphate-buffered, saline laxative reduced lead absorption over 50% in rats administered a single oral lead acetate dose, presumably by promoting the formation of less soluble lead salts. A popular phosphate-containing carbonated beverage also decreased lead absorption approximately 30% after oral lead acetate or lead-based paint doses, possibly by decreasing solubility, dissolution rate and/or GI motility. It is possible that these household products, and those with similar ingredients, may be safely used to reduce lead absorption in humans.