Short communication Estimation of the specific surface area of soil particles by adsorption of polyvinylalcohol in aqueous suspension

Autor:	Walter R. Fischer, Sibylle Pagel-Wieder
Rok vydání:	2001
Předmět:	chemistry.chemical_classification Topsoil Goethite Materials science Silicon dioxide Analytical chemistry Soil Science Mineralogy Plant Science chemistry.chemical_compound Adsorption Monomer chemistry visual_art Specific surface area visual_art.visual_art_medium Organic matter Hydrogen peroxide
Zdroj:	Journal of Plant Nutrition and Soil Science. 164:441
ISSN:	1522-2624 1436-8730
DOI:	10.1002/1522-2624(200108)164:4<441::aid-jpln441>3.0.co;2-h
Popis:	Adsorption of polyvinylalcohol (PVA) in aqueous suspension has been used to measure the specific surface area (SSA) of a silicon dioxide, a goethite, a clay, and a sample of a topsoil, the latter before and after treatment with hydrogen peroxide. Surface areas were calculated from each of the plateaus of the isotherms derived from the Langmuir equation fitted to the data, using a value of 0.04268 nm2 for the molecular area of a monomer of PVA. We compared these SSA values with those measured by N2 adsorption. The SSA values of the silicon dioxide, the goethite and the clay are in excellent agreement with the corresponding N2-BET areas. The removal of organic matter by H2O2 from the topsoil sample led to a marked increase in the SSA measured by the BET-method. For this sample, the SSA measured by PVA was considerably larger than the one that was obtained by the BET-method and showed only a little change after removal of SOM.
Databáze:	OpenAIRE
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