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Estimate of botanical ingredients in respirable cotton dust.

Authors
Morey-PR
Source
Department of Biological Sciences, Texas Tech University, Lubbock, Texas 1979 Jan; :1-20
Link
NIOSHTIC No.
00091814
Abstract
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.
Keywords
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;
Contact
Biological Sciences Texas Tech University Post Office Box 4149 Lubbock, Ten 79409
Publication Date
19790101
Document Type
Final Grant Report
Funding Amount
54181
Funding Type
Grant
Fiscal Year
1979
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00667
NIOSH Division
OEP
Priority Area
Pulmonary-system-disorders
Source Name
Department of Biological Sciences, Texas Tech University, Lubbock, Texas
State
TX
Performing Organization
Texas Tech University, Lubbock, Texas
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