Flouride

Fluoride

Fluoride is best known for preventing tooth decay. Water authorities often add fluoride to drinking water to maintain approximately a 1.0 mg/L (ppm) concentration. Fluoride can be found naturally in groundwater, particularly if a reservoir is in close proximity to seawater. While fluoride does help prevent tooth decay, too little can be ineffective while too much can stain teeth. Hanna Instruments offers a wide variety of instrumentation for measuring free fluoride in potable water, soft drinks, wine, emulsified food products, plating, and pickling acids. Products include benchtop and portable pH/ISE meters that can use a solid-state fluoride Ion-Selective Electrode (ISE) for direct measurement. Both benchtop and portable meters have the ion charge and molecular weight pre-programmed in order to take ion concentration measurements along with multiple units of measure. The benchtop meters have incremental methods built-in. The incremental methods include the known addition method in which a known volume of a known standard is added to known volume of sample. The meter takes two reading, before and after the addition, and then performs the calculation to determine the unknown concentration of the original sample. This method is useful for low levels of fluoride. Hanna offers a variety of colorimetric methods to measure fluoride by an adaptation of the SPADNS method found in the Standard Methods for the Examination of Water and Wastewater, 23rd edition. Available technologies include Spectrophotmeter, benchtop and portable photometers, as well as the Checker HC.