Лако-красочные материалы — производство

The determination of sodium nitrite is done by the well known oxidation method with potassium permanganate. This procedure, how­ever, always gives too high values for the plant chemist since the per­manganate oxidizes any other oxidizable material which may be present in the nitrite. Despite this disadvantage, the method is used in nitrite plants. Only one other method is available to the dye chemist, namely, the sulfanilic acid method which, with practice, can be made to give accurate results.