ION-PAIR LIQUID-CHROMATOGRAPHIC ELUTION BEHAVIORS OF PRECIOUS-METAL TETRATHIACROWN ETHER COMPLEXES

We developed a procedure that can effectively separate and determine p recious metal ions, such as Ag(I) and Pd(II), in some samples with rev erse phase ion-pair high performance liquid chromatography, employing indirect spectrophotometric detection method of their tetrathiacrown e ther complexes. Eluting the solutions of the metal-thiacrown ether com plexes with a MeCN-water. mobile phase(pll 2.20 adjusted with CH2ClCOO H buffer) containing 0.000 similar to 0.025 M sodium dodecyl sulfate(S DS) and 1.0 x 10(-4) M sodium 1-naphthalene sulfate(SNS) through mu-Bo ndapak CN column, the elution behaviors were elucidated as ion-pairing in case of [SDS] < 0.010 M and micelle forming in case of [SDS] > 0.0 10 M. As three applications, Ag(I) ion in black-white photographic fix ing solution, Pd(II) ion in an artificial sea water and palladium meta l in a catalyst for the clean up of car exhaust gases were analyzed in the optimum condition.