Abstract
The crystallization of barium sulfate has been studied, at 25°C, by conductimetric and radiochemical methods both in the absence and presence of nitrilotri (methylenephosphonic acid) NTMP. The marked reduction in rate constant for crystal growth in the presence of NTMP is interpreted in terms of a Langmuir adsorption isotherm reflecting the blocking of active growth sites on the barium sulfate crystals. The results of a carbon-14 study of the adsorption of NTMP on barium sulfate crystals, clearly demonstrate the heterogeneity of the surface sites. At an additive concentration corresponding to complete inhibition of crystal growth, it is estimated that less than 5% of the crystal surface is covered by adsorbed NTMP molecules.
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