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Extractable iron aluminum silicon and carbon in b horizons of podzolic and brunisolic soils from ontario canada



Extractable iron aluminum silicon and carbon in b horizons of podzolic and brunisolic soils from ontario canada



Canadian Journal of Soil Science 65(3): 489-496



To investigate the content of amorphous forms of Fe, Al and Si in podzolic soils, the B horizons from 54 Humo-Ferric Podzols and 24 Eluviated Dystric Brunisols were sampled in northern Ontario. Dithionite-citrate-bicarbonate (CDB) Fed and Ald, acid NH4-oxalate Fe0, Al0 and Si0, Na-pyrophosphate Fep, Alp and Cp and NaOH-tetraborate Fet and Alt were determined on all samples. Fe0/Fed ratios averaged 0.87 and suggested that most of the extractable Fe was amorphous. Inorganically bound Fe and Al in pyrophosphate extracts were estimated by addition of NH4OH to that extracted by DCB, was calculated at 79 .+-. 23%, whereas the corresponding value for Al was 61 .+-. 20%. (Al0-Alp)/Si0 atomic ratios, plus linear correlation analysis of (Al0-Alp) against Si0, suggested the presence of amorphous aluminosilicates with Al/Si ratios approaching 3. (Feorg + Alorg)/Cp ratios averaged 0.10, a figure near the value suggested by other authors for the maximum amount of Fe and Al bound to organic matter. (Cp/(Fep + Alp) atomic ratios did not appear to be useful in differentiating Podzolic from Brunisolic soils.

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