Abstract
Relationships between Surface Areas of Red Tropical Soils Measured by Different Methods
Highlights
The results show that test procedures can be divided into three groups in terms of increasing spread in the test results - polar molecules and direct measurement tests with a spread of Jess than 15%, methylene blue and BET tests with a spread of about 30% and Blaine, Fisher and granulometric tests with a spread of about 50% when plotted against ethylene glycol monoethyl ether (EGME) data
Surface area is used in the engineering practice to correlate the size of particles of granular materials with other engineering properties
The statistical correlations based on the assumption of a linear relationship between the various surface area measurements are given in Table II for those cases where the coefficient of correlation was greater than 0.70
Summary
Surface area is used in the engineering practice to correlate the size of particles of granular materials with other engineering properties. The adsorption of polar molecules of ethylene glycol, glycerol and ethylene glycol monoethyl ether (EGME) (Bower and Gschwend, 1952) is the traditional method for measuring surface area in soils and agricultural studies This method is characterized by a relatively high degree of precision and repeatability, but is slow and time consuming making it unsuitable for such applications as process control where a rapid feedback is required. The BET method -The surface areas of the fines fraction of the red tropical soil samples were determined using the methodology described by Brito and Ferreira (1984) This method, which for the first time was described by Brunauer, Emmett and Teller in 1938, gives numerical values of surface area in m2/g to the nearest 0.01 m2/g.
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