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The use of a unique threshold concentration curve as an indication of soil pore structural stability is questionable. Not only is the choice of a particular value of relative hydraulic conductivity arbitrary but, in addition, the threshold concentration curve does not reveal soil resistance to hydraulic conductivity reductions over a range of solution composition or concentration changes. In order to overcome this deficiency an empirical sodium stability model is proposed which expresses the relationship between the slopes of the threshold concentration curves as a function of the degree of hydraulic conductivity reduction. This model provides a means of evaluating both the susceptibility to hydraulic conductivity reductions and the degree of hydraulic conductivity change as the percolate concentration is altered.
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Cass et al. (1982) studied this question.
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