Effect of Various Impurities on the Metastable Zone Width of Boric Acid

Abstract

The metastable zone width of boric acid in aqueous solutions was measured in the presence of Ca+2, Mg+2, Cr+3, Fe+2 ions. For the measurements of metastable zone width, the polythermal method was used. The impurity concentration is varied from 0 to 1000 ppm in each aqueous solution. It was found that the range of metastable zone width of boric acid in aqueous solutions is considerably affected by impurities. The width of metastable zone of aqueous solution of boric acid is reduced with increasing impurity concentration. In the presence of Ca+2 and Cr+3, the equilibrium saturation concentration is changing.

Solubility and Seeded Metastable Zone width of functional sugar L-arabinose

“…This could be explained by the change in saturation temperature and nucleation rate. It has been proved that addition of Ca 2+ changes the saturation temperature of borax decahydrate and boric acid and the effect is concentration dependent (Gürbüz & Özdemir, 2003;Sayan & Ulrich, 2001). In the present study, it was proved that the solubility increment in the 2.0% calcium chloride-water system was larger than that in the 4.0% calcium chloride-water system.…”

Nucleation mechanism and kinetics from the analysis of polythermal crystallisation data: methyl stearate from kerosene solutions

“…At such a moment the solution concentration would hardly surpass the limit of metastability as a great amount of crystals would be formed leading to a rapid drop in supersaturation. [6,9,[13][14][15][16] . In this particular case, through a material balance, the rate of supersaturation change by cooling can be correlated to the nucleation rate as expressed through the following semi-empirical formula:…”

Effect of impurities on the metastable zone width of solute–solvent systems

“…nucleation order m and nucleation constant k), which have no physical significance. However, despite this, the Nývlt's equation has been used universally for the analysis of experimental data on nucleation kinetics [1][2][3][4][5][6].…”