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KMID : 0381319940330030132
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Korean Journal of Occupational Health
1994 Volume.33 No. 3 p.132 ~ p.140
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Particle Size Distributions of Wood Dust by Cascade Impactor
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Abstract
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In order to estimate the dust concentrations and the particle size distributions of wood works, dust samples were collected with the Marple´s personal cascade impactor from the milling, the cutting and the sanding works in 8 furniture factories located in the Kimpo Industrial area.
The particle size distributions were analyzed by the cumulative frequency and the generalized histogram methods.
The results were as follows:
1. There were no significant differences of total dust concentrations among the milling, the cutting and the sanding works, which accounted for 3.80 mg/㎥, 4.25 mg /㎥ and 4.28mg/㎥, respectively. The percentages of inspirable to total dust concentrations were 54.4% for the milling, 60.5% for the cutting and 59,9% for the sanding works.
2. No significant differences of geometric means(GM) obtained by the cumulative frequency method were found among the milling(9.14 ㎛), the cutting(9.12 ㎛) and the sanding(9.83㎛) works.
3. The particle size distributions of wood dust analyzed the histogram method were bimodals in all three work processes studied. No significant differences of GMs of the small and large modes were found among the milling (1.16㎛, 19.60 ㎛), the cutting (2.03㎛, 19.10㎛) and the sanding(1.09㎛, 19.72㎛) works.
4. No significant differences of GMs determined by the cumulative frequency method and the GMs of each mode estimated by the histogram method were found.
This study suggested that dust particles from wood works could be classified as the inspirable dust. Thus, it is recommended that an appropriate size selective instrument designed to collect the inspirable dust be utilized to estimate workers´ exposure to wood dust. Because of bimodal nature of wood dust size distributions, it is recommended to use the histogram rather than the cumulative frequency method for the analysis of the particle size distributions of wood dust.
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