Variability in total dust exposure in a cement factory
| Autor: | Abdolhossein Poornajaf, Hossein Kakooei, Farhad Ferasaty, Ali Akbar Kakouei |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Construction Materials
Health Toxicology and Mutagenesis Metallurgy Public Health Environmental and Occupational Health Dust Cement mill Random effects model Crusher Extraction and Processing Industry Animal science Occupational Exposure Environmental science Geometric standard deviation Humans Occupational exposure limit Maximum Allowable Concentration Geometric mean Workplace Arithmetic mean Exposure assessment |
| Zdroj: | Industrial health. 50(1) |
| ISSN: | 1880-8026 |
| Popis: | Exposure assessment is a main component of epidemiologic studies and variability in exposure. This assessment is considered as a common approach for such phenomenon. A total of 129 dust samples were collected randomly from 197 personnel from a cement factory located in Ilam province, during 2009 in Iran. The between- and within-group components of variability were determined to assess the contrast in exposure level between the Similar Exposure Groups (SEGs) and to calculate the within-worker geometric standard deviation of the theoretical exposure-response slope. Results were analyzing by one-way random effects model. According to the mentioned model, the probability of long-term mean exposure exceeding to the occupational exposure limit (OEL) was assessed for each SEGs. The arithmetic means (AM) of total dust levels ranged from 0.04 to 39.37 mg/m(3). The geometric means (GM) of total dust were higher in the crusher (20.84 mg/m(3)), packing (17.29 mg/m(3)), kiln (16.78 mg/m(3)), cement mill (14.90 mg/m(3)), and raw mill (10.44 mg/m(3)). However, the figures for the maintenance and administration parts were 3.77 mg/m(3) and 1.01 mg/m(3), respectively. The random effects model data demonstrated that the F-value calculated was greater than the critical F-value approximately 59% of the variability in the exposure was due to differences between groups. Based on these finding, the order of probability of the long-term mean exposure exceeding (Z) to the OEL of 10 mg/m(3) for total dust which were in kiln (100%), packing (100%), cement mill (90%), crusher (73%), raw mill (60%) administration (2.3%) and the maintenance parts (0%). |
| Databáze: | OpenAIRE |
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