“In this PA-enhanced limestone defluoridation (PAELD) technique, fluoride is removed from 0.526 mM ….50-52.60 μM in 3 h with near neutral final pH. The presence of PA … fluoride removal capacity of limestone to 1.10 mg/g … 0.39 mg/g reported in its absence.”
“The changes in fluoride removal with variation in initial PA concentration, initial fluoride concentration and the final pH have been found to be statistically significant with p < 0.05.”