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The Dissolution of Synthetic Goethites: The Early Stage¹

ABSTRACT

The kinetic curve for the early stage of dissolution of synthetic goethite is linear except for a small curved region close to the origin. This curved region has been shown to be due to the very rapid dissolution of a small amount of amorphous ferric hydroxide which is associated with the goethite.

The amount of amorphous ferric hydroxide is usually no more than 0.2% of the total mass of goethite. Its presence cannot be detected even by electron diffraction methods.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Inst. of Agriculture, Univ. of Western Australia, Nedlands 6009.

² Postgraduate Student, Associate Professor, and Professor, respectively. Dep. of Soil Science and Plant Nutrition, Inst. of Agriculture, Univ. of Western Australia, Nedlands 6009.

Received for publication July 24, 1973. Accepted for publication November 21, 1973.