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Interference by organic complexation of Fe and A1 on the SO2-4 adsorption in Spodic B horizons in Sweden.

Authors :
KARLTUN, E.
GUSTAFSSON, J. P.
Source :
Journal of Soil Science; 1993, Vol. 44 Issue 4, p625-632, 8p
Publication Year :
1993

Abstract

SUMMARY The relations between pH, different fractions of Fe and A1 and Na<subscript>4</subscript>P<subscript>2</subscript>O<subscript>7</subscript>-soluble C and the amount of adsorbed SO<superscript>2-</superscript><subscript>4</subscript> were assessed by analysing 63 soil samples from 14 podsolized soils in Sweden. The amount of adsorbed SO<superscript>2-</superscript><subscript>4</subscript> was significantly better correlated with the calculated amount of the inorganic fraction of Fe and A1 oxides obtained by subtracting Na<subscript>4</subscript>P<subscript>2</subscript>O<subscript>7</subscript>-soluble Fe and A1 from oxalate-soluble Fe and Al than with the oxalate extraction alone. There was a close correlation between C and organically-bound S in the Na<subscript>4</subscript>P<subscript>2</subscript>O<subscript>7</subscript> extract which shows that the C:S ratio of the extracted fulvic acids is about constant in the soils studied. It was found that, as the proportion of organically-complexed Fe and Al increases, the ability of the soil to adsorb SO<superscript>2-</superscript><subscript>4</subscript> decreases. The amount of adsorbed SO<superscript>2-</superscript><subscript>4</subscript> expressed on the basis of the amounts of oxalate-soluble Fe and Al was generally smaller in areas with low S deposition (< 60 mmol m<superscript>-2</superscript> a<superscript>-1</superscript>). The ratio between pyrophosphate-soluble C and oxalate-extractable Fe and Al was negatively correlated with pH in water. It was concluded that Fe and Al associated with organic matter cannot adsorb SO<superscript>2-</superscript><subscript>4</subscript> and that the degree of this association is pH dependent. These observations have important implications regarding the effects of anthropogenic acidification. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00224588
Volume :
44
Issue :
4
Database :
Complementary Index
Journal :
Journal of Soil Science
Publication Type :
Academic Journal
Accession number :
91217920
Full Text :
https://doi.org/10.1111/j.1365-2389.1993.tb02327.x