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Retention of vanadium (V) by three Finnish mineral soils
Author(s) -
MIKKONEN A.,
TUMMAVUORI J.
Publication year - 1994
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/j.1365-2389.1994.tb00520.x
Subject(s) - soil water , vanadate , adsorption , chemistry , molybdate , vanadium , desorption , sodium molybdate , mineral , analytical chemistry (journal) , ionic bonding , mineralogy , ion , inorganic chemistry , environmental chemistry , soil science , geology , organic chemistry
Summary Retention of V(V) by three Finnish mineral soils from 10 −4 m and 10 −5 m sodium vanadate solutions was investigated at room temperature in the pH range 2.3–7.5. In adsorption experiments, 0.02 m KCl was used as ionic medium, and the samples were left to equilibrate for 72 h. The solid: solution ration was 1:100 (m: v). Maximum adsorption occurred at pH ∼4, where 70–80% of the added V (350–400 μg g −1 from 10 −4 m solution and 35–40 μg g −1 from 10 −5 m solution) was retained by each soil. Retention was significant even at pH 6, where adsorption of a similar anion, molybdate, is negligible. Desorption of the retained V was measured by adding 50.0 cm 3 of 0.02 M KCl into weighed soil samples and shaking for 17 h in a mechanical stirrer. Only a minor part of retained V could be removed from each soil by the KCl treatment. Retention of different ionic species of V from 10 −5 m solution is approximated using values of log K obtained from the literature. In these calculations, kaolin is used as a reference material.