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Control of Zn, Cu and Mn activities in alkaline and calcareous soils equilibrated with EDTA

Published online by Cambridge University Press:  27 March 2009

S. P. Singh
S. P. Singh
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
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Summary

The modified EDTA (ethylenediaminetetraacetic acid) method of determining the ionic activities in soils developed by Norvell was used to measure Zn2+, Cu2+ and Mn2+ activities including the competition of Ca and Mg for the chelating ligand EDTA. In the Zn-EDTA system, the equilibrium mole fraction of CaL2− + MgL2− increased with an increase in pH of the soil solution, thereby leading to a decrease in the concentration of transition metal ions. In view of the pH dependence of the metal ion activities, the values of the expression pM + 2 pOH (where M may be Zn, Cu or Mn) were used to discuss the possible role of various oxides, hydroxides, carbonates, sulphides and unknown solid phases in regulating the activities of Zn2+, Cu2+ and Mn2+ ions in alkaline and calcareous soils.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 98 , Issue 1 , February 1982 , pp. 203 - 207
Copyright
Copyright © Cambridge University Press 1982

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References

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