ISSN:
1573-2932
Keywords:
acid-buffering reactions
;
acid deposition
;
aluminium
;
element budget
;
soil acidification
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Abstract The present study aimed to assess thebuffering reactions and identify the sources of ionreplenishment by carrying out a laboratory leachingexperiment using some soils from a humid, temperateregion of Northern Spain. The experiment consisted ofthe addition of a solution of H2SO4 to fivesoils developed on various types of parent materials(granulite, serpentinite, schist, granite and sandysediments) and differing markedly in their mineralogyand chemical properties. Although the treatmentconsiderably intensified the leaching of base cations,the exchangeable fraction increased or was notaffected, which indicated significant mobilization ofthese elements from non exchangeable fractions. Thesoils differed markedly in the amounts ofSO4 2- retained, however only a small part ofthe amount retained in the upper horizons wasadsorbed. Acid load was mainly produced by freedeposited H+ and nitrification of internalorganic N. Sulphate retention was the dominantbuffering mechanism in the soils developed onserpentinite and schist. Proton consumption linked toAl mobilization occurred in the surface horizons ofall soils, but especially in the most acidic soils,those on granite and schist. In the soil on sandysediments, the dissolution of CaCO3 constitutedthe only buffering mechanism.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005231307465
