Study on the Elution Behaviors of Molybdate and Tungstate in Both Hydrochloric and Perchloric Acid by Anion Exchange Chromatography

[摘要] The elution behaviors of molybdate and tungstate through anion exchange column have been investigated in the various concentration of hydrochloric and perchloric acid. A discussion is made to evaluate the existing these equilibrium and constant according to acidity. In both acids of 0.01-2.0 M concentration range, the existing equilibrium for molybdate and its constant calculated at 20�? is 1018.9 for Mo8O24- + 20H+ �? 8MoO22+ + 10H2O. In the 3-3.5 M hydrochloric acid it is 0.16 for MoO2Cl2 + Cl- �? MoO2Cl3- and for the case of tungstate, in the both acids of 0.01-1.0 M concentration range 106.6 for W12O396- + 6H+ �? 12WO3·3H2O. In higher concentration than 1.0 M both acids the following equilibrium seems to be existed. 12WO3·3H2O �? 12WO3 + 3H2O

[学科分类] 化学（综合）