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Estimate of botanical ingredients in respirable cotton dust.

Morey PR
Department of Biological Sciences, Texas Tech University, Lubbock, Texas 1979 Jan; :1-20
The plant part composition of respirable raw cotton dust was investigated to specify a standard reference material for continuing investigations of byssinosis etiology. The percentage weight content of each gross botanical trash component in the seven raw cotton grade divisions was analyzed. The capacity of each type of plant trash to produce respirable particulates during an abrasive milling process was determined by simulating early steps in the raw cotton processing operation. Botanical trash analyses were performed on a total of 71 raw cottons, including samples from each of the grade divisions. The friability of each trash component was determined by roller milling plant material greater than 500 micrometers in diameter, and sifting the pulverized remains on a 10 micrometer mesh screen, then recovering particulate that was less than 10 micrometers. The percentages of each milled plant material converted into respirable particulate were: 29 percent wood, 28 percent bract, 19 percent exo/mesocarp, 16 percent petiole, 5.6 percent leaf blade, 2.5 percent nightshade weed, 2.4 percent endocarp, and 0.3 percent seedcoat. The authors estimated the ratio for composition of respirable dust to be 58:22:20 in bract:leaf:weeds, 99:1 in seedcoat:seedmeat, and wood to petiole was 37:63. They concluded that leaflike dust (largely bract) was most concentrated in respirable particulates. The stem bark and exo/mesocarp made smaller but significant contributions to dust less than 10 micrometers in diameter, while the contribution of the seed and endocarp was minimal. The relative percentage composition of each botanical ingredient did not vary greatly between the different grades, however the total amount of botanical dust was predicted to vary with each grade.
NIOSH-Grant; Pulmonary-system-disorders; Airway-response-disorders; Respiratory-system-disorders; Textiles-industry; Particulate-dust; Airborne-particulates; Pathogenesis; Plant-fibers; Textile-workers; Standards; Cotton-ginning; Control-technology;
Biological Sciences Texas Tech University Post Office Box 4149 Lubbock, Ten 79409
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Department of Biological Sciences, Texas Tech University, Lubbock, Texas
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Texas Tech University, Lubbock, Texas
Page last reviewed: January 28, 2022
Content source: National Institute for Occupational Safety and Health Education and Information Division