Abstract: Three micellar modifying analytical reagents containing a quaternarynitrqgen atom and a hydroxyl group, i.e. hexadecyl (2-hydroxyethyl)-dimethylammonium chloride (HEMAC), tetradecyl (2-hydroxyethyl) dimethyl-ammanium chloride (TEMAC) and dodecyl (2-hydroxyethyl)dimethylammoniumchloride (DEMAC) were synthesized. The physico-chemical properties andanalytical characteristics of these reagents are evaluated. The synthesizedsurfactants can be used as sensitizing and solubilizing reagents for spectrophoto-metric analysis. Some examples of the micellar improved spectropl otometricsystems by using these reagents such as Sc(Ⅲ)-CAS, Fe(Ⅲ)-CASand Ge(Ⅳ)-PF are given. The sensitizing effects of the proposed reagents are similar tothose of cationic surfactants mixed with alcoholic organic solvents.

Key words: Alkyl(2-hydroxyethyl)dimethylammonium chloride, Micellar sensiti-zer, Speotrpphotometry