- P-ISSN 1225-0163
- E-ISSN 2288-8985
The elution behaviors in reversed-phase liquid chromatography were investigated thermodynamically for 2-hydroxy-arylazopyrazolone chelates with Ni(II), Cu(II), Co(III), Cr(III) on Novapak <TEX>$C_{18}$</TEX> column. There was a good linear dependence of the capacity factor(k') on the variations of column temperature in van't Hoff plot. From this result, it was confirmed that the retention mechanism of these chelates in the reversed phase liquid chromatography system was invariant under the condition of various temperatures. For the most cases of the chelates studied, the dependence of capacity factor(1n k') on enthalpy<TEX>$(-{\Delta}H)^{\circ}$</TEX>, calculated by van't Hoff plot showed a good linearity(r