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Estimating historical respirable crystalline silica exposures for Chinese pottery workers and iron/copper, tin, and tungsten miners.

Authors
Zhuang-Z; Hearl-FJ; Odencrantz-J; Chen-W; Chen-BT; Chen-JQ; McCawley-MA; Gao-P; Soderholm-SC
Source
Ann Occup Hyg 2001 Nov; 45(8):631-642
NIOSHTIC No.
20032114
Abstract
Collaborative studies of Chinese workers, using over four decades of dust monitoring data, are being conducted by the National Institute for Occupational Safety and Health (NIOSH) and Tongji Medical University in China. The goal of these projects is to establish exposure-response relationships for the development of diseases such as silicosis or lung cancer in cohorts of pottery and mine workers. It is necessary to convert Chinese dust measurements to respirable silica measurements in order to make results from the Chinese data comparable to other results in the literature. This article describes the development of conversion factors and estimates of historical respirable crystalline silica exposure for Chinese workers. Ambient total dust concentrations (n>17 000) and crystalline silica concentrations (n 347) in bulk dust were first gathered from historical industrial hygiene records. Analysis of the silica content in historical bulk samples revealed no trend from 1950 up to the present. During 1988-1989, side-by-side airborne dust samples (n 143 pairs) were collected using nylon cyclones and traditional Chinese samplers in 20 metal mines and nine pottery factories in China. These data were used to establish conversion factors between respirable crystalline silica concentrations and Chinese total dust concentrations. Based on the analysis of the available evidence, conversion factors derived from the 1988-1989 sampling campaign are assumed to apply to other time periods in this paper. The conversion factors were estimated to be 0.0143 for iron/copper, 0.0355 for pottery factories, 0.0429 for tin mines, and 0.0861 for tungsten mines. Conversion factors for individual facilities within each industry were also calculated. Analysis of variance revealed that mean conversion factors are significantly different among facilities within the iron/copper industry and within the pottery industry. The relative merits of using facility-specific conversion factors, industry-wide conversion factors, or a weighted average of the two are discussed. The exposure matrix of the historical Chinese total dust concentrations was multiplied by these conversion factors to obtain an exposure matrix of historical respirable crystalline silica concentrations.
Keywords
Dust-measurement; Dust-particles; Dust-inhalation; Dust-exposure; Dust-analysis; Silica-dusts; Silicates; Quartz-dust; Pottery-industry; Pottery-workers-lung; Mining-industry; Mineral-dusts; Mineral-processing; Exposure-assessment; Metal-dusts; Metallic-dusts; Metallic-minerals; Tungsten-minerals; Copper-dust; Respiratory-system-disorders; Respiratory-irritants; Respirable-dust; Pulmonary-disorders; Pulmonary-system-disorders
Contact
NIOSH, 1095 Willowdale Rd., Morgantown, WV, 26505
CODEN
AOHYA3
CAS No.
14808-60-7; 7439-89-6; 7440-50-8; 7440-31-5; 7440-33-7
Publication Date
20011101
Document Type
Journal Article
Email Address
zaz3@cdc.gov
Fiscal Year
2002
NTIS Accession No.
NTIS Price
Issue of Publication
8
ISSN
0003-4878
NIOSH Division
DRDS; HELD
Source Name
Annals of Occupational Hygiene
State
WV
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