Effects of household water filters on fluoride concentrations

从公共卫生的角度来看，自来水加氟是预防龋齿的一种很好的方法。在日本，只要当地居民同意，加氟也是可能的（厚生劳动省，2000年）。日本公民对安全饮用水供应的兴趣有所增加，因此，在水龙头上安装滤水器的家庭数量有所增加。因此，当进行氟化时，需要研究水通过过滤器后的氟化物（F）浓度。本研究以家用滤水器中常用的两种过滤材料为材料，制作了一种滤水器，并考察了过滤材料对F浓度的影响;以家用滤水器中常用的活性炭过滤器和中空纤维过滤器为材料，制作了一种简易的滤水装置 ...更多信息 系统.将NaF加入纯化水或自来水中，制备F浓度范围为0.1 - 10 mg/mL的各种供试品溶液。在通常使用的压力下使各试验溶液通过过滤系统，然后用F离子电极（直接阅读法）测定过滤后的F浓度。用流动注射装置测定过滤后过滤器中的F浓度，对于过滤器体积为10 L的所有试验溶液，通过活性炭过滤器过滤后的F浓度约为过滤前的1/10。此后，F浓度随着过滤体积的增加而增加。对于中空纤维过滤器，没有观察到过滤前后F浓度的变化。实验结束后，活性炭过滤器中含有高浓度的F。结果清楚地表明，氟化后自来水中的F浓度受到使用活性炭过滤器的家用水过滤器的影响。因此，必须考虑所用滤水器的类型，以确保水氟化的防龋齿效果。除F（Cl、Mg和Ca）以外的阴离子和阳离子被吸附到活性炭和中空纤维过滤器上。对于任何其他离子，均未获得连续性结果。少

The fluoridation of tap water is an excellent method from a public hygiene point of view for preventing dental caries. Fluoridation is now possible in Japan as well (Ministry of Health, Labour, and Welfare, 2000), provided the citizens in the area are in agreement. Interest in the supply of safe drinking water among Japanese citizens has increased, and as a result, there has been an increase in the number of households installing water filters on their taps. Therefore, when fluoridation is carried out, there is a need to study the concentrations of fluoride (F) after the water passes through the filter. In the present study, we have produced a water filter using 2 types of filter materials that are commonly used in household water filters and examined the effects of the filter materials on F concentrations.A simple water filtration device was constructed using activated charcoal filters and hollow fiber filters, both of which are widely employed as filters in household water filtration … More systems. NaF was added to purified water or tap water to prepare a variety of test solutions with F concentrations ranging from 0.1 to 10mg/mL. Each test solution was passed through the filtration system at a pressure normally used and then the F concentration after filtration was determined with an F ion electrode (direct reading method). The F concentration in the filter after filtration was measured using a flow-injection apparatus.The F concentration after filtration through the activated charcoal filter was approximately 1/10 that of before filtration for all test solutions up to a filter volume of 10L. Subsequent to this, the F concentration increased as the volume filtered increased. No change in the F concentration before and after filtration was observed for the hollow fiber filter. The activated charcoal filters contained high concentrations of F after completion of the experiments.The results clearly indicate that the F concentration in tap water after fluoridation is affected by household water filters that use activated charcoal filters. Therefore, the type of water filter used must be taken into consideration in order to ensure the anti-dental caries effect of water fluoridation. Negative and positive ions other than F (Cl, Mg, and Ca) were adsorbed to the activated charcoal and hollow fiber filters. Definitive results were not obtained for any other ions. Less