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The Use of Color to Quantify the Effects of pH and Temperature on the Crystallization Kinetics of Goethite under Highly Alkaline Conditions

Published online by Cambridge University Press:  28 February 2024

Tetsushi Nagano ,
Satoru Nakashima ,
Shinichi Nakayama  and
Muneaki Senoo
Tetsushi Nagano
Affiliation:
Environmental Geochemistry Laboratory, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-11, Japan
Satoru Nakashima
Affiliation:
Geological Institute, Faculty of Science, The University of Tokyo, Hongo, Tokyo 113, Japan
Shinichi Nakayama
Affiliation:
Environmental Geochemistry Laboratory, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-11, Japan
Muneaki Senoo
Affiliation:
Environmental Geochemistry Laboratory, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-11, Japan
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Abstract

The crystallization kinetics of goethite were studied colorimetrically under highly alkaline conditions (pH 10.1–12.2) at temperatures from 40° to 85°C. Color changes during crystallization from fresh precipitates, plotted on a*-b* colorimetric diagrams, were used to discriminate between pure goethite and mixtures of goethite and hematite. Only the b* value increased as goethite crystallization proceeded, and even a minor increase in the a* value revealed the existence of hematite. The rate of goethite crystallization, estimated from the b* value, could be modeled by a pseudo-first-order rate law. This rate depended both on pH and on temperature. Apparent activation energies for the reactions of 56.1 kJ/mol at pH 11.7 and 48.2 kJ/mol at pH 12.2 were estimated from Arrhenius plots.

Keywords

ColorColorimetryCrystallizationGoethiteHematiteKineticsL*a*b* color space
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 2 , April 1994 , pp. 226 - 234
Copyright
Copyright © 1994, Clay Minerals Society

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