Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-17T21:20:57.007Z Has data issue: false hasContentIssue false

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
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India

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
Copyright
Copyright © Cambridge University Press 1982

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Dhillon, S. K., Sinha, M. K. & Randhawa, N. S. (1975). Chemical equilibria and Q/I relationship of zinc in selected alkali soils of Punjab. Journal Indian Society of Soil Science 23, 3846.Google Scholar
Ellis, B. G. & Knezkk, B. D. (1972). Adsorption reactions of micronutrients in soils. In Micronutrients in Agriculture (ed. Mortvedt, J. J., Giordano, P. M. and Lindsay, W. L.), pp. 5975. Madison, Wisconsin: Soil Science Society of America.Google Scholar
Griffin, R. A. & Jurinak, J. J. (1973). Estimation of activity coefficients from the electrical conductivity of natural aquatic systems and soil extracts. Soil Science 116, 2630.CrossRefGoogle Scholar
Hodgson, J. F., Lindsay, W. L. & Trierweiler, J. F. (1966). Micronutrient cation oomplexing in soil solution. II. Complexing of zinc and copper in displaced solution from calcareous soils. Soil Science Society of America Proceedings 30, 723726.CrossRefGoogle Scholar
Jackson, M. L. (1958). Soil Chemical Analysis. Englewood Cliffs, New York: Prentice-Hall.Google Scholar
Jenne, E. A. (1968). Controls on Mn, Fe, Co, Ni, Cu and Zn concentrations in soils and waters. The significant role of hydrous Mn and Fe oxides. Advances in Chemistry Series 73, 337387.CrossRefGoogle Scholar
Kittrick, J. A. (1976). Control of Zn2+ in the soil solution by sphalerite. Soil Science Society of America Journal 40, 314317.Google Scholar
Krauskopf, K. B. (1972). Geochemistry of micronutrients. In Micronutrients in Agriculture (ed. Mortvedt, J. J., Giordano, P. M. and Lindsay, W. L.), pp. 736. Madison, Wisconsin: Soil Science Society of America.Google Scholar
Lindsay, W. L. (1972). Inorganic phase equilibria of micronutrients in soils. In Micronutrients in Agriculture (ed. Mortvedt, J. J., Giordano, P. M. and Lindsay, W. L.), pp. 4157. Madison, Wisconsin: Soil Science Society of America.Google Scholar
Lindsay, W. L. (1979). Chemical Equilibria in Soils. New York: Wiley.Google Scholar
Lindsay, W. L. & Norvell, W. A. (1969). Equilibrium relationships of Zn2+, Fe2+, Ca2+ and H+ with EDTA and DTPA in soils. Soil Science Society of America Proceedings 33, 6270.Google Scholar
Lindsay, W. L. & Norvell, W. A. (1978). Development of a DTPA soil test for zinc, iron, manganeso and copper. Soil Science Society of America Journal 42, 421428.CrossRefGoogle Scholar
Marion, G. M. & Babcock, K. L. (1976). Predicting specific conductance and salt concentration in dilute aqueous solutions. Soil Science 122, 181187.Google Scholar
Mishra, S. G. & Tiwari, R. C. (1966). Retention and release of copper and zinc by some Indian soils. Soil Science 101, 465471.Google Scholar
Norvell, W. A. (1970). Solubility of iron in soils. Ph.D. thesis, Colorado State University.Google Scholar
Norvell, W. A. (1972). Equilibria of metal chelates in soil solution. In Micronutrients in Agriculture (ed. Mortvedt, J. J., Giordano, P. M. and Lindsay, W. L.), pp. 115136. Madison, Wisconsin: Soil Science Society of America.Google Scholar
Udo, E. J., Bohn, H. L. & Tucker, T. C. (1970). Zinc adsorption by calcareous soils. Soil Science Society of America Proceedings 34, 405407.Google Scholar