SEM identification of biogenic silica in jute: silica in human lung following exposure to burning jute.
DeNee-PB; Abraham-JL; Gelderman-AH; Shaw-GB
NIOSH 1974 Jul; :1-7
Identification of biogenic silica (7631869) in respired dust resulting from an industrial accident was undertaken using the scanning electron microscope. The accident involved the inhalation of smoke from burning cotton bales in jute bags. The subject was a 56 year old male who was exposed for 14 hours to dense smoke from the burning cotton bales. Patient was examined 4 months after the accident when he complained of shortness of breath. Clinical history, X-ray analysis and pulmonary function test results were consistent with interstitial pulmonary inflammation. Lung tissue biopsies revealed an uncommon disorder, bronchiolitis obliterans, in which the small airways of the lung are obstructed by granulation tissue. To characterize soot particles in the lung, in situ X-ray microanalysis of lung tissue sections and the backscattered electron imaging mode were used. Backscattered electron imaging enabled the identification of particles which had a higher average atomic number than the surrounding tissue. Such particles were also found in the jute bagging material which were similar to those found in lung tissue. Several particles were identified which contained silicon (7440213) while others were found which contained silicon plus small amounts of magnesium (7439954), aluminum (7429905), calcium (7440702), potassium (7440097), titanium (7440326), and iron (7439896). Results are taken to indicate that at least some of the silicon containing particles came from the burning jute. It is suggested that the silica material from the jute was biogenic, since the morphology of the particles was similar to the biogenic silica found in various dicotyledonous plants.
Minerals; Oxides; Analytical-methods; Pulmonary-system-disorders; Dust-analysis
7631-86-9; 7440-21-3; 7439-95-4; 7429-90-5; 7440-70-2; 7440-09-7; 7440-32-6; 7439-89-6
Appalachian Laboratory for Occupational Respiratory Diseases, NIOSH, Morgantown, West Virginia (Paper Proceedings of Microbeam Analysis Society, Ottawa, 7 pages, 13 references