Acid-base properties of water-soluble organic matter of forest soils, studied by the pK-spectroscopy method

Using the potentiometric titration and pK spectroscopy method, acid-base properties of water-soluble organic matter of forest soils have been studied. Five acidic classes composed of different substances with pK(a) values around 3.6; 4.8; 6.7; 8.7 and 9.7 have been identified. Testing the properties...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2006-11, Vol.65 (8), p.1426-1431
Main Authors: Shamrikova, E.V, Ryazanov, M.A, Vanchikova, E.V
Format: Article
Language:English
Subjects:
acid-base balance
acid-base properties
Acids - chemistry
Alkalies - chemistry
dissolved organic carbon
dissolved organic matter
forest soils
Hydrogen-Ion Concentration
Organic Chemicals - analysis
Organic Chemicals - chemistry
organic compounds
pK spectroscopy
potentiometric titration
soil organic matter
Soil Pollutants - chemistry
Solubility
spectroscopy
Spectrum Analysis
titration
Titrimetry
Trees
Water - chemistry
water solubility
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Summary:Using the potentiometric titration and pK spectroscopy method, acid-base properties of water-soluble organic matter of forest soils have been studied. Five acidic classes composed of different substances with pK(a) values around 3.6; 4.8; 6.7; 8.7 and 9.7 have been identified. Testing the properties of soluble soil fraction, it is to be taken into account that when it is isolated from non-soluble soil matter, some water-soluble substances remain in soil and do not pass into the solution. Most firmly adsorbed in soil are water-soluble components with pK(a) 9.6-9.8.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2006.03.057