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Prevalence of Pneumoconioses among Phosphate Rock Workers in Brazil.

Authors
de Capitani-EM
Source
NIOSH 1990 Nov:1310-1311
NIOSHTIC No.
00199465
Abstract
The prevalence of pneumoconioses among phosphate (1306054) rock workers in Brazil was assessed. The 73 workers evaluated in the investigation were exposed to phosphate rock extracted in the states of Goias and Minas Gerais, where the material was crushed and then transported to Paulinia for storage in underground mills. Subjects submitted to a detailed respiratory questionnaire, a physical examination emphasizing the respiratory system, pulmonary function tests, chest x-rays, and, in two cases, lung biopsies through thoracotomy. The quantity of free silica (7631869) in airborne samples was measured by colorimetric analysis. A semiquantitative analysis was performed on airborne samples using x-ray spectrometry. Twenty of the workers were noted to have pneumoconioses. Mean exposure was 46 months. The majority of the cases had no respiratory symptoms. No significant fibrosis was noted, and no pleura disease or mediastinal alterations were observed. No traces of free silica were detected by diffraction analysis. The author concludes that the high prevalence of pneumoconioses noted in this study must derive from the particularly poor working conditions at the facilities. A regular followup using lung function tests and chest x-rays should be included in the routine examination of phosphate rock workers.
Keywords
Worker-health; Work-environment; Mine-workers; Quarry-workers; Workplace-studies; Phosphates; Silica-dusts; Silicosis; Occupational-health; Occupational-diseases; Occupational-exposure; Occupational-hazards;
CAS No.
1306-05-4; 7631-86-9;
Publication Date
19901101
Document Type
Conference/Symposia Proceedings;
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
(NIOSH) 90-108
Source Name
Proceedings of the VIIth International Pneumoconioses Conference
State
PA;
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