Collect. Czech. Chem. Commun. 1993, 58, 1997-2002

Effect of Impurities on the Width of the Metastable Region of Potassium Sulfate

Miloslav Karel and Jaroslav Nývlt

Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 160 00 Prague, Czech Republic


The width of the metastable region of potassium sulfate was measured in the presence of various concentrations of chromate, copper(II) and aluminium ions. The dependence of the metastable region width on the impurity concentration is generally nonlinear and in some cases even changes its nature; while in low concentrations some impurities make the metastable region narrower, they make it broader if present in higher concentrations. The effect of the impurities increases in order K2Cr2O7 - CuSO4 - Al2(SO4)3.