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The experimentally determined Koc values of 282,624 and 2,658,608 (log Koc: 5.5 to 6.4) indicate that the read-across substance C12-16 ADBAC will adsorb to soil, does not easily desorb and can be considered immobile. Cationic surfactants adsorb to soil mainly due to ionic interaction with negatively charged surfaces. This means that there will be a poor correlation with organic carbon in soil and that sorption should not be normalized to the organic matter content in soil. Rather, the average Kd values should be used to estimate the solids-water partition coefficient in soil. When organic matter is not a determining factor in distribution in soil, sediment and suspended sediment, there is no difference in adsorption to these three compartments (based on dry weight) as the organic matter content is the only variable. This means that the solids-water partition coefficients in sediment and suspended sediment are both equal to 13,630 L/kg.

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