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Properties of Water-Dispersible Colloids from Macropore Deposits and Bulk Horizons of an Agrudalf

^a Chemistry Dep., The Royal Veterinary and Agricultural Univ., Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
^b DHI Water & Environment, Agern Allé 11, DK-2970 Hørsholm, Denmark
^c Currently at: Dep. of Agroecology, Danish Institute of Agricultural Sciences, PO Box 50, DK-8830 Tjele, Denmark

View larger version (142K): [in a new window]   Fig. 1. Micromorphology image (plane-polarized light) of an intact structure from the BCtg-horizon showing (a) macropore deposits (MP-BCtg) of laminated clay colloids, (b) macropore matrix (MM-BCtg), and (c) macropore area.

View larger version (31K): [in a new window]   Fig. 2. Influence of CaCl2–concentration (EC) and pH on (a, c) -potential, and (b, d) relative increase in mean hydrodynamic particle diameter (dH) of water-dispersible colloids (WDC) from different soil horizons and colloidal size fractions. Error bars: ± SE correspond to measurements on three replicate samples.

View larger version (25K): [in a new window]   Fig. 3. Effect of removal of organic matter (OX) and organic matter plus sesquioxides (OX + CBD) on the -potential of water-dispersible colloids (WDC) from different soil horizons and colloidal size fractions as a function of pH. Error bars: ± SE correspond to measurements on three replicate samples.

View larger version (26K): [in a new window]   Fig. 4. Effect of removal of organic matter (OX) and organic matter plus sesquioxides (OX + CBD) on the mean hydrodynamic particle diameter (dH) of water-dispersible colloids (WDC) from different soil horizons and colloidal size fractions as a function of pH. Error bars: ± SE correspond to measurements on three replicate samples.