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Cross-sectional silica exposure measurements at two Zambian copper mines of Nkana and Mufulira.

Authors
Hayumbu-P; Robins-TG; Key-Schwartz-R
Source
Int J Environ Res Public Health 2008 Jun; 5(2):86-90
NIOSHTIC No.
20034030
Abstract
We measured the quartz content of 20 bulk settled dust and 200 respirable dust samples in a cross-sectional dust exposure assessment that is part of an epidemiological study to ascertain the risk of nonmalignant respiratory diseases among Zambian copper miners. Dust samples were collected from the copper mines of Mopani Copper Mine plc (Mufulira and Nkana Mines). Analytical measurements employed NIOSH Method 0600 for gravimetric analysis of respirable dust and NIOSH Method 7500 for quartz analysis in bulk and respirable dust samples. The measured quartz content of respirable dust showed that 59% and 26% of Mufulira and Nkana Mine samples, respectively, were above the calculated U.S. Occupational Safety and Health Administration permissible exposure limit. The mean intensities of respirable dust exposure at Mufulira and Nkana were 0.992 mg/m3 (range 0-7.674) and 0.868 mg/m3 (range 0-6.944), respectively while the mean intensities of respirable quartz at Mufulira and Nkana were 0.143 mg/m3 (range 0-1.302) and 0.060 mg/m3 (range 0-0.317), respectively. These results indicate weak dust monitoring at these mines which may increase the risk of nonmalignant disease in many miners. Since Zambian mining regulations do not have crystalline silica exposure limits, these results accord with the recommendation that Zambian mining houses and the government establish crystalline silica analysis laboratory capacity and adopt dust mass concentration occupational exposure limits for more protective dust monitoring of workers.
Keywords
Quartz-dust; Silica-dusts; Respirable-dust; Mining-industry; Respiratory-system-disorders; Pulmonary-system-disorders
Contact
Dr. Patrick Hayumbu, University of Michigan, School of Public Health, Department of Environmental Health Sciences, 1420 Washington Heights Ann Arbor, MI 48109-2029, USA
CODEN
IJERGQ
CAS No.
14808-60-7
Publication Date
20080601
Document Type
Journal Article
Email Address
phayumbu@umich.edu
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Issue of Publication
2
ISSN
1660-4601
NIOSH Division
DART
Priority Area
Construction; Mining
Source Name
International Journal of Environmental Research and Public Health
State
MI; OH
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