For a soil sample received in your lab, the fraction of organic carbon has been reported to be 0.15.

You have done two isotherm experiments and you have obtained the following results:

Test 1: Aqueous-phase concentration 0.30 [µg/kg] and solid-phase concentration: 0.360 [µg/kg]

Test 2: Aqueous-phase concentration:0.20 [ug/kg] and solid-phase concentration: 0.240 [μg/kg]