Fluoride Filtration: Prevention To Fluorosis
Lucia Huo
Prince of Wales
Floor Location : J 077 P

Dental fluorosis is a chronic disease caused by excessive exposure to fluoride during early childhood years. I studied fluoride adsorption capacity of chemicals: calcium carbonate (CaCO3), calcium chloride (CaCl2), activated alumina (Al2O3) and magnesium hydroxide (Mg(OH)2), in which CaCl2 was proved to be the most effective fluoride adsorbent.rnrnFluoride is one of the three major chemicals that cause large-scale health problems through drinking water exposure. The goal of this experiment is to find a possible favorable and low-cost method to prevent the development of fluorosis. The discovery of a new way to prevent this irreversible disease can potentially save millions of people from the disorder of bones and teeth.rnrnThe purpose of this experiment was to find the chemical that is the most effective in defluoridation with the chemicals being: CaCO3, CaCl2, Al2O3 and Mg(OH)2 using the adsorption method. The adsorption process was carried out using filters. The innovation of the defluoridation filter eliminates the biggest flaw of water fluoridation; the rate of fluorosis can be controlled without stimulating the increase of the rate of dental caries. The experiment focused on the effectiveness of each material. If successful, the occurrence of fluorosis can be prevented with a low-cost, beneficial material and by using an advantageous method.rnrnThe hypothesis was that Al2O3 would be the most effective fluoride adsorbent because it had the largest surface area of all adsorbent candidates. However, it was proved incorrect. rnrnFour filters were built, each consisting a different candidate adsorbent and a fifth one was the control. Liquid containing fluoride was poured through each of the filters. Then the results were tested with a fluoride ion-selective electrode. The expected results were found using stoichiometry. Two sets of data were obtained -experimental and theoretical- which I analyzed statistically using a student's t-test. rnrnMore experiments revolving this topic will be carried out in the future to achieve higher accuracy in the results and to expand the scope. I strongly believe that this project can eventually expand beyond science and influence the social and economic aspects of the world. rn