The most active element known is fluorine. However, in environmental engineering applications it is not used much in the elemental state. The fluorine atom in the neutral state takes an electron and goes into the ion state and takes the name fluoride. Fluoride does not take place on its own in nature, but may co-exist with the counter ion in a solution. Therefore, fluoride ion containing substances are generally called fluoride.

The best known use of fluoride is toothpastes. Fluoride is effective for the development of teeth, but damage to organs or tissues is possible due to excessive fluoride uptake. In addition, fluoride is a substance that causes advanced joint diseases. For dental health, the average fluoride concentration of 1 mg / l is sufficient.

Fluoride is naturally present in water, but it is still possible to add it to drinking water in a controlled manner. However, if the fluoride concentration is high, this can lead to dental and bone disorders in humans and animals. Therefore, accurate and accurate determination of fluoride determination is of great importance for health.

Today, the most sensitive methods for the determination of fluoride in drinking and utility water are the colorimetric method and the electrode method. However, the easiest fluoride determination is made with ion-selective electrode. In this method, standard fluoride solutions are prepared and the device is adjusted to measure in the desired range. For this, the fluoride concentration of the water to be measured should be approximate.

Determination of fluoride is carried out in authorized laboratories within the scope of chemical tests. In these studies, the standards published by domestic and foreign organizations are complied with. The following are a few standards for the determination of fluoride:

• TS EN 12173 Chemicals for the treatment of drinking and domestic water - Sodium fluoride
• TS EN ISO 10304-1 / AC Water quality - Determination of dissolved ions by liquid ion chromatography - Part 1: Determination of bromide, chloride, fluoride, nitrate, nitrite, phosphate and sulfate
• TS 4234 ISO 10359-1 Water quality - Determination of fluoride - Part 1: Electrochemical probe method for potable and slightly contaminated water