The ion pairing generates a coloured lipophilic ion pair, which may be extracted into an natural solvent for instance chloroform and a quantitative measurement from the colour extracted could be made spectrophotometrically. This type of assay is described from the BP for Clonidine Injection and Benzhexol Tablets. [Pg.317] Anionic surfactants https://cationic-emulsifier99527.activoblog.com/34029149/5-easy-facts-about-esterquats-described