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Surface tension effects of cotton dust.
Proceedings of the Seventh Cotton Dust Research Conference, beltwide cotton production research conferences, January 3-4, 1983, San Antonio, Texas. Wakelyn PJ, Jacobs RR, eds. Memphis, TN: The National Cotton Council of America, 1983 Jan; :159-163
The effect of cotton dust on the surface tension of the surfactant dipalmitoyl-lecithin was assessed. The surface tension of synthetic L-alpha-dipalmitoyl-lecithin (DPL) films were measured in the presence and absence of known concentrations of the cotton dust using a Wilhelmy balance. Surface tension was plotted against surface area for four consecutive cycles until time equilibrium was attained. The minimum tension of the lecithin film was less than 2 dynes per centimeter when the DPL film was fully compressed. The hysteresis of the lecithin film at minimum surface area decreased by approximately 50 percent in the presence of cotton dust. The same treatment increased the minimum surface tension of the film. Sprinkling higher concentrations of cotton dust onto the lecithin film increased the surface tension area hysteresis and decreased the surface tension. The effects of the cotton dusts on hysteresis were modified by solvent extraction. Extraction of the dust with either water, chloroform, 70 percent acetone, or methanol lowered the hysteresis area relative to the unwashed dust. Successive washing of cotton dust with chloroform, water, methanol, and 70 percent acetone completely eliminated the lecithin hysteresis. The authors conclude that surface active material on the cotton dust leached onto the lecithin films, affecting surface tension properties. At concentrations likely to be found in the lung, cotton dust may interact with the surface by absorbing surfactant.
Airborne-particles; Respiratory-irritants; Air-contamination; Pulmonary-function; Fibrous-dusts; Cotton-industry; Textiles-industry
Proceedings of the Seventh Cotton Dust Research Conference, beltwide cotton production research conferences, January 3-4, 1983, San Antonio, Texas
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division