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Appl Environ Microbiol. 1991 March; 57(3): 642-644
Copyright © 1991, American Society for Microbiology. All Rights Reserved.

Rate of Pyrite Bioleaching by Thiobacillus ferrooxidans: Results of an Interlaboratory Comparison

Gregory J. Olson

Polymer Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

ABSTRACT

Ten laboratories participated in an interlaboratory comparison of determination of bioleaching rates of a pyrite reference material. A standardized procedure and a single strain of Thiobacillus ferrooxidans were used in this study. The mean rate of bioleaching of the pyrite reference material was 12.4 mg of Fe per liter per h, with a coefficient of variation (percent relative standard deviation) of 32% as determined by eight laboratories. These results show the precision among laboratories of the determination of rates of pyrite bioleaching when a standard test procedure and reference material are used.

Present address: Pittsburgh Energy Technology Center, P.O. Box 10940, Pittsburgh, PA 15236.

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