Morphology and Fluorescence of Respirable Plant Part Dusts.
Proceedings of the Third Special Session on Cotton Dust Research, Beltwide Cotton Production Research Conference, Phoenix, Arizona, January 9-10, 1979 1979 Oct:2-3
The morphological characteristics and fluorescence properties of plant parts found in respirable plant dusts were investigated. The purpose of the study was to determine if respirable dusts, containing particles with diameters less than 10 microns, arising from raw cotton trash could be differentiated on the basis of their shape or fluorescence properties from similar sized particles found in cotton seed oil mills. The respirable bract, endocarp, seed coat, silverleaf night shade leaf dusts, and other plant parts were isolated from raw cotton plant trash and examined by light and fluorescence microscopy. Based on morphological examination alone, it was not possible to determine which plant part was responsible for the respirable cotton dusts. Seed coat particulates and blade leaf particles in the 3 to 10 micron size range fluoresced with a yellow/tan color. All other plant parts fluoresced predominantly blue. The amount of dust in the respirable size range obtained from various plant parts, during processing of low middling cotton, was determined by pulverizing the plant parts and then recovering particles less than 10 microns in diameter and weighing them. The major botanical components of respirable dust were: leaf material (mostly bract), 66 percent; seed coat, 1 percent; stem, 18 percent; endocarp, 1 percent; exomesocarp, 9 percent; and bark, 5 percent. The author concludes that it should be possible to distinguish raw cotton dust which fluoresces mostly blue from oil mill particulates which fluoresce mostly yellow/tan, and that leaflike trash makes the largest single contribution to respirable dust during the processing of low middling raw cotton.
NIOSH-Grant; Cotton-dust; Respirable-dust; Microscopic-analysis; Cotton-industry; Physical-properties; Plant-oils; Morphology; Dust-analysis;
Proceedings of the Third Special Session on Cotton Dust Research, Beltwide Cotton Production Research Conference, Phoenix, Arizona, January 9-10, 1979
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