As majority of the sorption equilibrium equations are nonlinear, care should be taken in estimating their parameters, because in some situations, the confidence interval of the least-squares (LS) estimators may not be appropriate. In these cases, some procedures are available in the literature to validate the statistical properties of the LS estimators of nonlinear models. In this work, the nonlinear measures are used to discriminate, between six equations that represent the sorption equilibrium isotherms of kale seeds (Brassica oleracea L. var. acephala D.C.). Results show that the Halsey modified equation is the best one to describe the experimental data.
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