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Published in Soil Sci Soc Am J 36:755-761 (1972)
© 1972 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Equilibrium Relationships of Metal Chelates in Hydroponic Solutions1

A. D. Halvorson and W. L. Lindsay2

ABSTRACT

Stability-pH diagrams were developed to describe the equilibrium relationships of metal ions with chelating agents in nutrient solutions for the following chelating agents: EGTA, EDTA, DTPA, CDTA, and EDDHA. These stability diagrams give the concentration of each chelated metal species in solution in the pH range of 4 to 9 and provide a reliable means for selecting appropriate chelating agents for specific purposes. With increased pH, displacement of Fe3+ from the following chelating agents by divalent cations is in the order EGTA > EDTA > DTPA > CDTA > EDDHA. Similar developments can be extended to other chelating agents and to nutrient solutions of different composition.

NOTES

Contribution from the Dep. of Agronomy, Colorado State Univ., Fort Collins 80521. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Published with the approval of the Director of the Colorado State Univ. Exp. Sta. as Scientific Series Paper no. 1658. This work was supported in part by the Geigy Agricultural Chemical Division of Ciba-Geigy Corporation.

2 Graduate Research Assistant and Professor of Soil Science, respectively, Colorado State Univ., Fort Collins. The senior author is now Soil Scientist, USDA, ARS, Sidney, Montana 59270.

Received for publication January 17, 1972. Accepted for publication May 26, 1972.






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