Radiographical appearance of talcosis and composition of talc.

Details

• Personal Author:
  Du Y ; Li Z ; Liu J ; Wang R ; Zhao J
• Description:
  The results of a study of talcosis in workers exposed to talc (14807966) were discussed. Industrial hygiene monitoring data for a facility in the China consisting of a talc mine, mill, and talc carving factory were summarized. Dust concentrations at the facility ranged from 68 to 5561mg/m3 in the 1950s and 1960s. Although dust control measures were implemented in the 1970s dust concentrations on the order of 50 to 395mg/m3 still occur at the facility. Most of the dusts consisted of particles having diameters below 5 microns. The free silica (14808607) content of the dust ranged from 0.95 to 2.87%. A mineralogical analysis of the ore processed indicated that it was essentially pure talc containing small amounts of serpentine, phosphorite, and quartz as impurities. No fibrous or asbestiform minerals were detected. Ninety seven cases of talcosis (70 in males) were diagnosed at the facility since 1958. Eighty occurred in the miners and 17 in employees at the talc carving factory. Twenty four cases were complicated by tuberculosis. Irregular small opacities were the typical radiographic features of the cases. Reticulate and nodular opacities predominated in early stage talcosis. Large shadows in the lung fields were seen in late stage talcosis. Enlarged hilar lung nodes were usually not observed. The authors conclude that the studied worker population was exposed to pure talc. The X-ray manifestations of talcosis resemble those of silicosis.
• Subjects:
  Accidents, Occupational Air Pollutants, Occupational Hazardous Substances Occupational Health Safety Solvents
• Keywords:
  Chemical Analysis Chest X Rays Epidemiology Mineral Dusts Mining Industry Occupational Exposure Respiratory System Disorders
• Publisher:
  National Institute for Occupational Safety and Health
• Document Type:
  Text
• Genre:
  Conference/Symposia Proceedings
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  846-851
• NIOSHTIC Number:
  nn:00199281
• Citation:
  Proceedings of the VIIth International Pneumoconioses Conference, August 23-26, 1988, Pittsburgh, Pennsylvania, USA. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 90-108, 1990 Nov; (Pt II):846-851
• CAS Registry Number:
  Talc (Mg3H2(SiO3)4) (CAS RN 14807-96-6) ; Quartz (SiO2) (CAS RN 14808-60-7)
• Federal Fiscal Year:
  1991
• Peer Reviewed:
  False
• Part Number:
  II
• Source Full Name:
  Proceedings of the VIIth International Pneumoconioses Conference, August 23-26, 1988, Pittsburgh, Pennsylvania, USA
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9f466e6d4d05ffaee03a6114efcd6e7b6e0737a733a8bd8d528bfe2780e1bb834b58a133b71b636b09455b7ff8bc8d36c0939521e896c26cd0cef5e0366c32d3
• Download URL:
  https://stacks.cdc.gov/view/cdc/180722/cdc_180722_DS1.pdf
• File Type:
  [PDF - 180.23 KB ]