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Measurement of soil aggregate density by volume displacement in two non-mixing liquids

^a Facultad de Ciencias Agrarias, Univ. Nacional de La Plata, Calles 60 y 119, CC 31, 1900 La Plata, Argentina
^b Dep. of Environmental Sciences, Rutgers, The State Univ. of New Jersey, 14 College Farm Road, New Brunswick, NJ 08901-8551

View larger version (22K): [in a new window]   Fig. 1. Force diagram applied on a porous object submerged in either kerosene (a) or in a water-glycerin mixture (b). The symbols are F = force, W = weight, and B = buoyancy. The object contains variable amounts of solid (-S), pore-filling liquid (kerosene, -K) and trapped air (-A). See text for explanation.

View larger version (25K): [in a new window]   Fig. 2. Diagram of the experimental setup to measure bulk volume of a porous object using two non-mixing liquids, which in this work were kerosene and a mixture of water and glycerin.

View larger version (18K): [in a new window]   Fig. 3. A comparison between bulk volumes of soil aggregates measured with a modified pycnometric method with kerosene, and with the proposed technique using two non-mixing liquids (a), and a plot of the residuals of the fitting procedure (b). The symbols represent three ranges of soil aggregate densities covered. Values on axes equal reported values times the indicated factor.