Water, NaHCO3-, NaH2PO4- and NaCl-extractable SO42- in acid forest soils

Alewell, C. and Matzner, E.. (1996) Water, NaHCO3-, NaH2PO4- and NaCl-extractable SO42- in acid forest soils. Journal of plant nutrition and soil science, Vol. 159, No. 3. pp. 235-240.

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Official URL: http://edoc.unibas.ch/dok/A5251188

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A variety of different methods have been used for the determination of inorganic soil SO42- in the past, which makes it difficult to compare SO42- contents of soils. Sulfate was extracted with the four commonly used extraction solutions 0.5 M NaHCO3, 0.02 M NaH2PO4, 0.1 M NaCl and H2O from A-, Bw- and Bs-horizons of six acid forest soils. 5 g of field moist soil were percolated with a flow rate of 5 ml/h and percolations were repeated as long as SO42- was detectable in the percolate (< 0.5 mg SO4 . l-1). NaCl and NaHCO3 extracted highest amounts of total inorganic SO42- in A-horizons, but NaHCO3 caused analytical problems. NaHCO3 and NaH2PO4 yielded highest amounts in B-horizons. With the exception of Bs-horizons more than 70% of the total inorganic SO42- was H2O-soluble. Thus, if H2O-soluble SO42- is defined as reversibly bound, the greater part of the inorganic SO42- fraction can potentially be released, if SO42- deposition decreases.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Umweltgeowissenschaften (Alewell)
UniBasel Contributors:Alewell, Christine
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Verlag Chemie
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:28
Deposited On:22 Mar 2012 14:05

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