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Molecular Weight of Montmorillonite from Optical Transmission Measurements¹

ABSTRACT

The weight average molecular weight of small Na-montmorillonite particles in aqueous suspension have been determined by means of optical density (OD) measurements. In the wavelength range of = 4000A to 6000A and in dilute clay suspension which obeys Beer-Lambert Law, the slope of the straight line of log (OD) vs. log is proportional to the major dimension of the particles. Assuming a disc geometry and the number of unit layers in a clay particle, and working with suspension with a slope near –4, the weight average molecular weight was found by using light scattering theory. The results agree reasonably with other data from the literature.

¹ Contribution from Northern Plains Branch, SWCD, ARS, USDA, The Hebrew University of Jerusalem, Faculty of Agriculture, and the Colorado Agr. Exp. Sta. Published with the approval of the Colorado Agr. Exp. Sta. as Scientific Paper no. 1396.

² Research Soil Scientist, USDA, and visiting Associate Professor, Colorado State University, Ft. Collins.

³ Lecturer, The Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot, Israel, respectively.

Received for publication October 20, 1969. Accepted for publication October 31, 1969.