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Modified Soxhlet Extractor for Pedologic Studies¹

ABSTRACT

The soxhlet apparatus has been used in the laboratory to stimulate geochemical weathering; however, the high extraction temperatures required in the soxhlet do not represent a realistic simulation of the weathering environment. A modified design of the original soxhlet did not eliminate the problems of extraction temperature or inaccurate volumes of solvent passing through the sample. These problems were solved by moving the extraction chamber away from the upward path of the refluxing solvent. Extraction temperature differences (approximately 52°C) were responsible for higher concentrations of leachate metal in the original soxhlet leachate when a minesoil sample was weathered. This modification permits exact volumes of solvent to be passed through the sample, as well as a reduction in extraction temperature that would allow study of the role of bacteria in the weathering process.

¹ Contribution from the Land Reclamation Program, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439. This work was sponsored by the U.S. Dep. of Energy under contract W-31-109-ENG-38.

² Assistant Environmental Scientist, Argonne National Laboratory; Professor of Chemistry, Saint Mary's College, Notre Dame, Ind.; and Undergraduate Research Participant at Argonne National Laboratory from the Dep. of Chemistry, Trinity Christian College, Palos Heights, Ill.

Received for publication March 2, 1982. Accepted for publication July 26, 1982.

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