Dissolution behavior of kaolinitic tropical soils

Jon Chorover, Garrison Sposito

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Batch experiments at controlled pH and ionic strength were conducted with representative kaolinitic soils from Brazil to investigate their short-time dissolution behavior. The release of Al and Fe from the soils showed similar pH dependence, exhibiting a minimum value (p.m.d.) just above the point of zero net charge for the soils. Both Al and Fe release rates below the p.m.d. were correlated positively with soluble organic C, proton concentration, and net proton surface charge, the last two relationships being power-law functions similar to those observed for the dissolution rates of specimen metal oxides and aluminosilicates. Below the p.m.d., release of Si from the soils exhibited a pH dependence very much like that observed for specimen kaolinites and the molar ratios, Si Al and Fe Al released, were smaller than 1.0, probably because of the rapid solubilization of organic Al forms. Above the p.m.d., colloidal dispersion occurred and Al, Si, and Fe were released in both dissolved and microparticulate forms.

Original languageEnglish (US)
Pages (from-to)3109-3121
Number of pages13
JournalGeochimica et Cosmochimica Acta
Volume59
Issue number15
DOIs
StatePublished - 1995
Externally publishedYes

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tropical soil
Dissolution
dissolution
Soils
Protons
soil
aluminosilicate
solubilization
Surface charge
Ionic strength
Oxides
power law
Metals
experiment
Experiments
rate

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Dissolution behavior of kaolinitic tropical soils. / Chorover, Jon; Sposito, Garrison.

In: Geochimica et Cosmochimica Acta, Vol. 59, No. 15, 1995, p. 3109-3121.

Research output: Contribution to journalArticle

Chorover, Jon ; Sposito, Garrison. / Dissolution behavior of kaolinitic tropical soils. In: Geochimica et Cosmochimica Acta. 1995 ; Vol. 59, No. 15. pp. 3109-3121.
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