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Fig. 3. Measurement of specific air–water interfacial areas (ai). (a) Breakthrough curves (BTCs) for methane and n-hexane at different water contents (
w). The pore volume scale is the total volume of column effluent after volatile organic compound (VOC) introduction divided by the gas volume in the column, and the term Cg is the concentration normalized by the total area of the BTC. (b) Measured mean total retardation factor (Rt) values for n-hexane and calculated ai values.
