Publications des agents du Cirad


Quality measurements. Application of methylene blue adsorption to cotton fiber specific area measurement. Part 1. Methodology

Kaewprasit C., Héquet E., Abidi N., Gourlot J.P.. 1998. Journal of Cotton Science, 2 (4) : p. 164-173.

Adsorption of methylene blue or 3,7 bis (dimethylamino) phenothiazin-5-ium ion was used to measure the specific surface areas of six cotton fibers taken from the International Calibration Cotton Standards. A kinetic study of this dye's adsorption to the cotton fibers was first conducted to establish the adsorption isotherms. From this study, the adsorption isotherm was determined at 25°C for 24 hours with the concentration of methylene blue solution in the range 0.004 to 0.18 x 10-3 kg L-1. After 24 hours, the concentration of methylene blue at the adsorption equilibrium was analyzed by a spectrophotometer at a wavelength of 660 nm. The specific surface area was then calculated from this isotherm. The specific surface areas for these cottons, B-26, C-36, D-5, E-4, G-17, and I-26 were found to be 32.32, 32.42, 34.48, 52.72, 43.96, and 29.91 x 10-3 km2 kg-1, respectively. The reliability of this method seems very good.

Mots-clés : coton; qualité technologique; propriété technologique; mesure; méthode

Article (b-revue à comité de lecture)

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