Abstract
Higher order complexation of beryllium with Chromazurol S at the charged micelle surface has been investigated for the improvement in operating conditions of highly sensitive spectrophotometric method using quaternary ammonium salt. Alkyl dimethyl benzylammonium, trimethyl alkylammonium and alkylpyridinium chloride were used as the quaternary ammonium salts. The insoluble ion associate forms in the lower concentration of quaternary ammonium chloride, the other hand, higher order complexation is difficult with the increase of quaternary ammonium chloride in the higher concentration region. The higher order complexation is often prevented because of the restriction of chelating group in the ligand by the micellar charge. In this case, the restriction of chelating group with micellar charge is suppressed by the existence of organic solvents such as ethanol, acetone, etc., and the formation of higher order complex is easy with the acceleration of complexation rate.The increase of counter ion by addition of potassium chloride gives the same effects as with organic solvent. The concentration region of quaternary ammonium chloride which the higher order complex forms quantitatively is extended by existence of ethanol, and also the effect of organic solvents are very useful for the spectrophotometric method using the charged micelle surface because of the decrease of foaming and the stabilization of the solution.
