Fluoride ion analyzerAnalysis method:

Fluoride ion selective electrode method

Fluorine reagent spectrophotometric method

Ion Chromatography

fluoride

Fluoride ion analyzerSelective electrode method

Fluoride ion selective electrode is a type of electrode made of lanthanum fluoride（LaF₃）Single crystal wafers are sensors with sensitive membranes and are typical crystal electrodes. Therefore, it has good selectivity. The structure of this electrode is shown in the figure3-30When measuring, it forms the following primary cell with the reference electrode and the measured solution:

Fluorine reagent spectrophotometric method

Fluorine reagent, also known as Alizarin chelating agent（ALC）The chemical name is1，2-Dihydroxyanthraquinone-3-methylamine-N，N-Diacetic acid. existpH4.1In the acetate buffer medium, it reacts with fluoride ions and lanthanum nitrate to form a blue ternary complex. The color depth is proportional to the concentration of fluoride ions620nmColorimetric quantification at wavelength. The reaction equation is as follows: