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Hydraulic Conductivity of an Allophanic Andisol Leached with Dilute Acid Solutions

^a Faculty of Environmental Science and Technology, Okayama Univ., 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
^b Raito Kogyo Co. Ltd., Kudan-Kita, Chiyoda-Ku, Tokyo 102-8236, Japan

View larger version (16K): [in a new window]   Fig. 1 Relative hydraulic conductivity change during dilute acid leaching (, H2SO4, pH 4, 0.1 molc m-3; , H2SO4, pH 3, 1 molc m-3; , HNO3 pH 4, 0.1 molc m-3; •, HNO3 pH 3, 1 molc m-3) .

View larger version (24K): [in a new window]   Fig. 2 Tensiometer pressure potential and pH distribution in the soil profile for HNO3 at pH 3. Numbers denote depth of solution percolated

View larger version (24K): [in a new window]   Fig. 3 Tensiometer pressure potential and pH distribution in the soil profile for H2SO4 at pH 3. Numbers denote depth of solution percolated

View larger version (18K): [in a new window]   Fig. 4 Relative hydraulic conductivity distribution in the soil profile at the end of the experiments for dilute acids at pH 3. Numbers denote depth of solution percolated

View larger version (12K): [in a new window]   Fig. 5 Effect of pH on light transmittance. (, SO2-4 1 molc m-3; , SO2-4 0.1 molc m-3; •, NO-3 1 molc m-3; , NO-3 0.1 molc m-3)

View larger version (18K): [in a new window]   Fig. 6 Acid addition curves of the soil for HNO3 and H2SO4