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Science 1 July 1966:
Vol. 153. no. 3731, pp. 70 - 71
DOI: 10.1126/science.153.3731.70
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Articles

Montmorillonite: Effect of pH on Its Adsorption of a Soil Humic Compound

M. Schnitzer 1 and H. Kodama 1

1 Soil Research Institute, Canada Department of Agriculture, Ottawa, Ontario

The d001 spacing of sodium montmorillonite increased from 9.87 to 17.50 angstroms after interaction of the compound with fulvic acid at pH 2.5. The magnitude of the spacing decreased with increase in pH between 2.5 and 6.0. A t pH 2.5 40 milligrams of Namontmorillonite adsorbed 31 mg of fulvic acid; at pH 6.0, only 15.8 mg.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)