Development of a computer-generated equilibrium model for the variation of iron and manganese in the hypolimnion of Lake Mendota
Abstract
A computer-generated chemical equilibrium model has been developed to predict the unusual seasonal variation of iron and manganese in the hypolimnetic water above the sediments in Lake Mendota. Models for the detailed chemical speciation of Mn and Fe have been developed as functions of pH, redox level, adsorption, and organic complexation. Results indicate that pH is the primary variable controlling the preferential release of Mn due to simultaneous pH dependent dissolution of solid MnCO_3 and desorption of Mn(II) from oxide surfaces. Progressive appearance of Fe is predicted in terms of a pH-dependent dissolution of iron oxides as influenced by organic complexation. Using the maximum observed concentrations of major chemical components as input data, we have reproduced experimentally determined variations of Mn and Fe as a function of pH over the range 8.7-6.9.
Additional Information
© 1981 American Chemical Society. Received for review August 16,1979. Accepted November 13,1980. Funds for this project were provided by the Graduate School of the University of Minnesota. Computer time was provided in part by the University of Minnesota Computer Center. This support is appreciated greatly. Our appreciation is extended also to Dr. Joseph Delfino of the University of Wisconsin, who willingly provided this data along with helpful comments, and to Ms. Pamela Beilke for computing assistance.Additional details
- Eprint ID
- 59796
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- CaltechAUTHORS:20150820-144459117
- University of Minnesota
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2015-08-20Created from EPrint's datestamp field
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2021-11-10Created from EPrint's last_modified field