Abstract
Threshold levels of chemical inhibitors are often used to kinetically prevent scale from forming. No theory exists which predicts the minimum level of scale inhibitor concentration which may be effective under varying aqueous solution conditions. When ionic calcium concentration is much greater than ionic carbonate, a model is proposed based upon the relative diffusion rates of the carbonate and the inhibitor ions from which the following criterion for the minimum concentration of inhibitor, which might be effective, is developed and tested: Z In(In z- ) > 2(CO 2- 3), where Z In is the magnitude of the charge on the inhibitor ion and () denotes molar concentration.
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