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Stability of Chlorite in Dilute Acid Solutions¹

ABSTRACT

Six chlorites representing 5 species were suspended in 0.01M MgCl₂ solutions with different concentrations of HCl. In 10^-4N HCl solutions a final steady pH of 8 to 9 was reached quickly with the Mg-rich chlorites and more slowly with Fe-rich species. The evidence showed that Mg-Al and Mg-Fe double hydroxides controlled the pH in these suspensions.

In 10^-2N HCl solutions, the chlorites remained at pH values of 3 to 4 for periods up to 6 months. On the basis of direct titrations it was concluded that precipitation of Fe- and Al-hydroxides buffered the pH at 3 to 5 and that the precipitate impeded H uptake and Mg release.

¹ Contribution No. 175, Soil Research Institute, Canada Department of Agriculture, Ottawa, Ontario. Presented before Div. S-2 and S-5, Soil Science Society of America, Nov. 1, 1965, at Columbus, Ohio.

² Research Officers.

Received for publication May 12, 1966. Accepted for publication June 9, 1966.