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Dissolution of feldspars in the presence of natural, organic solutes
Author(s) -
LUNDSTRÖM U.,
ÖHMAN LO.
Publication year - 1990
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1990.tb00071.x
Subject(s) - dissolution , distilled water , silicic acid , feldspar , weathering , chemistry , environmental chemistry , peat , aqueous solution , mineralogy , solubility , groundwater , geology , chromatography , geochemistry , paleontology , ecology , quartz , organic chemistry , biology , geotechnical engineering
SUMMARY The dissolution rates of feldspars in the presence of naturally occurring organic solutes were compared at pH 5.1. Natural silt or ground feldspar minerals were suspended in water, streamwater, soil water, water extracts of peat and mor and a citrate solution for approximately 100 d. The increase of major cations and silicic acid in the aqueous phase was determined by periodic sampling and rates of dissolution were calculated when concentration increased linearly with time. The dissolution rate for the major cations was 2.7±0.9 ( n = 3) times greater for stream‐water and 2.4±0.4 ( n = 5) times greater for mor and peat extract than for distilled water. For citrate, the rate was greater by 1.7±0.3 ( n =3) times. By inoculating the suspensions with microorganisms weathering rates decreased to the value for distilled water. This suggests that the microorganisms consumed some ‘active’ fraction of the organic solutes.