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Clays and Clay Minerals

, Volume 40, Issue 5, pp 600–607 | Cite as

Color Variations Associated with Rapid Formation of Goethite from Proto-Ferrihydrite at pH 13 and 40°C

  • T. Nagano
  • S. Nakashima
  • S. Nakayama
  • K. Osada
  • M. Senoo
Article

Abstract

Color variations from brown to yellow of synthesized goethite have been studied colorimetrically and spectroscopically. Goethite with various colors was synthesized at pH 13 and 40°C by varying the incubation time. Colorimetry revealed that the b* value (yellowish chroma) in L*a*b* color space was a quantitative indicator of color variations of the diluted samples. From UV-VIS-NIR spectra, the increase in the b* value was found to be caused by the increase in crystal field absorptions due to goethite formation around 500 nm. The b* value was a good indicator of the relative proportion of goethite in the precipitates including ferrihydrite. X-ray diffraction patterns and infrared spectra revealed that crystallization of goethite was associated with loss of water from the proto-ferrihydrite.

Key Words

Crystallization Colorimetry Goethite Infrared spectroscopy L*a*b* color space UV-VIS-NIR spectroscopy X-ray diffractometry 

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Copyright information

© The Clay Minerals Society 1992

Authors and Affiliations

  • T. Nagano
    • 1
  • S. Nakashima
    • 2
  • S. Nakayama
    • 1
  • K. Osada
    • 1
  • M. Senoo
    • 1
  1. 1.Environmental Geochemistry LaboratoryJapan Atomic Energy Research Institute TokaiNaka, IbarakiJapan
  2. 2.Research Institute of Natural ResourcesAkita UniversityAkitaJapan

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