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Gaseous Tracer Technique for Estimating Air–Water Interfacial Areas and Interface Mobility

^a Dep. of Environmental Engineering Sciences, Univ. of Florida, P.O. Box 116450, Gainesville, FL 32611-6450 USA
^b School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284 USA

View larger version (22K): [in a new window]   Fig. 1 Experimental setup for the gaseous tracer experiments

View larger version (31K): [in a new window]   Fig. 2 Breakthrough curves of the water-partitioning tracers at different water saturations

View larger version (16K): [in a new window]   Fig. 3 A comparison of the volumetric water contents determined gravimetrically and estimated using the gas-partitioning tracers. The solid line is for ideal 1:1 line

View larger version (34K): [in a new window]   Fig. 4 Breakthrough curves of the gaseous interfacial tracer (n-decane) at different water saturations. Inset graph shows methane BTCs at two water saturations

View larger version (25K): [in a new window]   Fig. 5 Air–water interfacial areas (ai) measured using gaseous and aqueous interfacial tracers. Data for SDBS are from Kim et al. (1997); data for the alcohols are from Kim et al. (1998). The solid line through the n-decane data is based on regression , while the dotted line is based on Eq. [9]

View larger version (153K): [in a new window]   Fig. 6 Scanning electron microscope (SEM) photographs of the sand sample used in this study. Photographs of three sand grains are shown in (A), (C), and (D). The sand grains had several "craters," a close-up of which is shown in (B) for the grain in (A)

View larger version (17K): [in a new window]   Fig. 7 The ratio of interfacial velocity to the bulk pore-water velocity (), based on the observed sodium dodecylbenzene sulfonate (SDBS) retardation factors (Kim et al., 1997) and the estimated hypothetical retardation factors of SDBS based on the air–water interfacial areas (ai) measured by gaseous interfacial tracer (n-decane) experiments