这些方法适用于NaF/AlF3摩尔比约为3的产品的替代品。火焰发射法的原理包括在氧/氢火焰中雾化试验溶液，并通过测量589 nm处的辐射强度进行测定。火焰原子吸收法的原理是基于空气/乙炔火焰中的原子化和测量钠空心管发射的589 nm线的吸收- 阴极灯。试验溶液的制备是在浓硫酸侵蚀后，将试验部分溶解在盐酸和水中进行的。

The methods are applicable as alternatives to products for which the molar ratio NaF/AlF3 is equal to about 3. The principle of the flame emission method consists in atomization of the test solution in a flame of oxygen/hydrogen and determination by measurement of the intensity of the radiation at 589 nm. The principle of the flame atomic absorption method is based on atomization in an air/acetylene flame and measuremnt of the absorption of the 589 nm line emitted by a sodium hollow-cathode lamp. The preparation of the test solution is carried out by dissolution of a test portion in hydrochloric acid and water after attack by concentreted sulphuric acid.