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Dissolution Kinetics of Hornblende in Organic Acid Solutions

^a Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078 USA
^b Dep. of Soil, Water and Climate, Univ. of Minnesota, St. Paul, MN 55108 USA

View larger version (24K): [in a new window]   Fig. 1 Quantity of Al, Fe, Mg, and Si vs. time from initially weathered hornblende into citric acid solution in a 0.01 M HOAc–LiOAc buffer at pH 4.0 and 298 K

View larger version (24K): [in a new window]   Fig. 2 Dissolution rates for Al, Fe, Mg, and Si calculated using the slope of the empirical equation and the mass transfer data shown in Fig. 1 vs. time

View larger version (28K): [in a new window]   Fig. 3 Dependence of the reaction rates for Al, Fe, Mg, and Si with respect to the dissolved organic C concentrations of citric and oxalic acids. The rates were calculated as integrated means from 15 to 30 d

View larger version (44K): [in a new window]   Fig. 4 The relative strength of five organic acids on promoting hornblende dissolution at 2.5 mM C in a pH 4.0, 0.01 M LiOAc–HOAC buffer at 298 K