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Particle-Size and Element Distributions of Soil Colloids

Implications for Colloid Transport

^a CRC for Freshwater Ecology, Water Studies Centre, Department of Chemistry, Monash University, Clayton, Victoria, Australia
^b School of Earth and Environmental Sciences, University of Adelaide, Glen Osmond, South Australia, Australia 5064
^c Currently at Dep. of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO 80401

View larger version (31K): [in a new window]   Fig. 1. Location map for the study site at Mt. Bold, South Australia.

View larger version (104K): [in a new window]   Fig. 2. Cross-sectional view of the soil profile showing the method of collection of the overland flow and throughflow samples at the various soil horizon boundaries.

View larger version (104K): [in a new window]   Fig. 3. Transmission electron micrographs of fractionated 0.2- to 1.0-µm colloids. The colloids were isolated from flow along the B2/B3 horizon boundary of the Prospect Hill sandy loam at elution volumes corresponding to mean equivalent spherical diameters of (a) 0.15, (b) 0.3, and (c) 0.8 µm.

View larger version (42K): [in a new window]   Fig. 4. UV detector (relative mass) and Al-, Fe- and Mg-based particle-size distributions (PSDs) for the 0.08- to 1.0-µm soil colloids from A1, A2, and B3 horizons.

View larger version (31K): [in a new window]   Fig. 5. UV detector (relative mass) and Al, Fe and Mg concentration-based PSDs for the 0.08- to 1.0-µm colloids from the B2 and B3 cutans.

View larger version (23K): [in a new window]   Fig. 6. Element atomic ratios versus PSDs for colloids from the A1 and B3 horizons and for the B3 cutans (a) Fe/Al and (b) Mg/Al

View larger version (18K): [in a new window]   Fig. 7. X-ray diffraction plots of (a) coarse (2-0.2 µm) and (b) fine (< 0.2 µm.) clays from the A1 and B3 horizons of the Prospect Hill sandy loam at Mount Bold.

View larger version (103K): [in a new window]   Fig. 8. Transmission electron micrographs of clays of size 0.2–1 µm fractionated by sedimentation field-flow fractionation (Sd FFF). Clay colloids were isolated from cutans in the B3 horizon of the Prospect Hill sandy loam (a) 0.3 µm; (b) 0.5 µm.

View larger version (52K): [in a new window]   Fig. 9. UV detector (relative mass) and Al-, Fe- and Mg-based PSDs for colloids from (a) the overland flow and throughflow samples from the A2/B1, B2/B3 and B3/C soil horizon boundaries.

View larger version (22K): [in a new window]   Fig. 10. Element atomic ratios versus PSDs for colloids collected from the flow samples (a) Fe/Al ratios from the overland flow and B2/B3 through flow, and (b) Mg/Al ratios from the overland flow and A2/B1 and B3/C infiltration flows.