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Aluminum Solubility Control in Different Horizons of a Podzol

^a Dep. of Soil Sci., Swedish Univ. of Agric. Sci. (SLU), 750 07 Uppsala, Sweden [present address: Jägerweg 6, 3014 Bern, Switzerland]
^b Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), 8903 Birmensdorf, Switzerland
^c Institute of Terrestrial Ecology, ETH Zurich, Grabenstrasse 3, 8952 Schlieren, Switzerland

View larger version (28K): [in a new window]   Fig. 1 Results of acid leaching experiment for samples from different depths in the profile (Table 2); a) oxalate extraction; b) pyrophosphate extraction; Alox and Alp:oxalate and pyrophosphate extractable Al in untreated samples; AlRox and AlRp:oxalate and pyrophosphate extractable Al in solid residues after successive acid leaching; AlL:total Al removed by acid leaching; AlL + AlRox and AlL + AlRp:sum of total leached Al and extractable Al in solid residues

View larger version (26K): [in a new window]   Fig. 2 IR-spectra in the range 600 to 300 cm-1 of the acid dispersible clay fraction <0.5 µm from the horizons Bs, BC1, and BC2 heated at 150°C and at 400°C, respectively

View larger version (113K): [in a new window]   Fig. 3 Transmission Electron Microscopy of the <0.5-µm acid dispersible clay fraction of the BC1 horizon

View larger version (22K): [in a new window]   Fig. 4 Values of log IAP vs. time for selected kinetic series. a) log IAP for Al(OH)3 (Eq. [1a]); b) log IAP for imogolite (Eq. [1b]). Initial H+-concentrations were 18.0 mM for (AE), 27.5 mM for Bh, 5.7 mM for Bs, 9.7 mM for BC1, and 9.8 mM for BC2

View larger version (20K): [in a new window]   Fig. 5 Results of batch equilibrium experiment. a) pAl vs. pH; the imogolite line assuming congruent dissolution obeys Eq. [7]; b) pSi vs. pH; c) (pAl + 0.5 pSi) vs. pH. Closed symbols, soil:solution = 1:10; open symbols, soil:solution = 1:2.5. The linear fittings in a) and c) were performed by structural analyses (see Webster, 1997) including all data at pH >4.1 of the Bh, Bs, BC1, and BC2 horizons. Structural analyses in b) was performed separately for both pH <4.1 and pH >4.1 for each of the four lower horizons. Solubilities of gibbsite (Palmer and Wesolowski, 1992), imogolite (Farmer and Fraser, 1982), proto-imogolite sol (Lumsdon and Farmer, 1995), quartz, and amorphous SiO2 (Stumm and Morgan, 1981) were calculated for 20°C by the van't Hoff equation