Measurement of the surface areas of mineral powders with a modified Perkin-Elmer, model 212-D, sorptometer using a nitrogen-helium gas mixture / K. Bartels, Mineral Sciences Division. : M34-20/162E-PDF

“This work compares the surface-area measurements made on four powdered materials (alumina, quartz, and two sodium carbonate powders) using the Sorptometer, employing nitrogen gas as adsorbate, with those made using the precise volumetric method (B.E.T.), employing krypton gas as adsorbate. It was found that the Sorptometer may be used successfully for rapidly comparing the surface areas of a large number of samples of a given material. However, if absolute accuracy is required, the Sorptometer must first be calibrated for each powdered material by the B.E.T. method. The use of the Sorptometer with a pre-mixed adsorption gas (35% N2 / 65% He, by volume) is described. The one-point method of evaluating the B.E.T. equation and the specific surface-area calculation for one of the carbonate samples are outlined. A computer program, written in FORTRAN IV language, which calculates the specific surface areas from Sorptometer data, is provided"--Abstract, p. i.

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