Abstract
Previous measurements of concentration gradients formed in long columns of supersaturated glycine solutions [1] indicate that small amounts of impurities, such as valine, can lead to an increase in the magnitude of the gradient. This might indicate that the impurity enhances the degree of cluster formation. The concentration gradients were measured in three aqueous supersaturated systems - glycine with valine as the additive, potassium sulfate with cobalt acetate as the impurity and sodium chloride in the presence of lead sulfate and chromic nitrate. Metastable zone widths of the superaturated solutions were also measured in the presence of these additives. The cluster sizes are estimated from the concentration gradient data in the presence and absence of additives and compared to the changes noted in the metastable zone widths. The changes in concentration gradients of concentrated solutions appear to be a reliable indicator of the effect of additives on cluster growth and nucleation.
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