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Fig. 3. Degree of nonsingularity, 
(Eq. [8]), of the measured naphthalene adsorption-desorption isotherms as a function of the adsorption isotherm nonlinearity, n'A. Open symbols represent short-term (48-h adsorption and 48-h desorption step) and closed symbols longer-term (504-h adsorption and 48-h desorption step) experiments. The broken line at = 100% defines whether the soil is a Type I or II soils (Gamst et al., 2001). 
data from present study, data from Gamst et al. (2001), data from Yuan and Xing (2001).
