Abstract
On the basis of recently derived theoretical expressions for the induction time in seeded and unseeded precipitation, nucleation and growth rates of BaSO 4 are separately determined in the absence and presence of a copolymer of maleic acid and vinyl sulfonic acid (PMA-PVS). From the seeded precipitation experiments at different supersaturations, BaSO 4 is found to grow by the mechanism of two-dimensional nucleation and its growth rate is determined. Complete determination of the BaSO 4 nucleation rate is also done via a combined analysis of the induction times in both seeded and unseeded precipitation. The presence of PMA-PVS in the solution appears to retard the growth and to stimulate the nucleation of BaSO 4.
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