Mass, Number and Surface Area Concentrations of α-Quartz Exposures of Refractory Material Manufacturing Workers

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• Mass, Number and Surface Area Concentrations of α-Quartz Exposures of Refractory Material Manufacturing Workers : Jyh-Larng CHEN, et al. Department of Environmental Engineering and Health, Yuanpei University College of Health Science, Taiwan-This study set out to assess the respirable mass, surface area, and number concentrations of the α-quartz content particles (C_r-m' C_r-s and C_r-n) to which workers were exposed in six different exposure groups, the raw material handling (n=10), crushing (n=12), mixing (n=12), forming (n=10), furnace (n=10), and packaging (n=10), in a refractory material manufacturing plant. For Cr_m, the exposure values in sequence were found as : mixing (68.1 μg/m^3)>packaging (55.9 μg/m^3)>raw material handling (53.3 μg/m^3)>furnace (31.0 μg/m^3)>crushing (29.8 μg/m^3)>forming (22.4 μg/m^3). We also found that 〜21.2-68.2% of the above Cr-m exceeded the current TLV-TWA for the a-quartz content (50 μg/m^3) suggesting a need for initiating control strategies immediately. We further conducted particle size-segregating samplings in four workplaces : crushing (n=3), mixing (n=3), forming (n=3), and furnace (n=3). We found that all resultant particle size distributions shared a quite similar geometric standard deviation (σ_g ; =2.24-2.92), but the process area, associated with higher mechanical energy (i.e., crushing process), contained finer a-quartz content particles (mass median aerodynamic diameter ; MMAD=3.22 μm) than those areas associated with lower mechanical energy (i.e., mixing, forming, and furnace ; MMAD=6.17, 5.95, and 8.92 μm, respectively).These results gave a ratio of C_r-m in the above four exposure groups (i.e., crushing : mixing : forming : furnace=1.00 : 2.30 : 0.753 : 1.04) which was quite different from those of C_r-s (1.00 : 1.74 : 0.654 : 0.530) and C_r-n (1.00 : 1.27 : 0.572 : 0.202). Our results clearly indicate the importance of measuring particle size distributions for assessing workers' free silica exposures.

著者

• Chen Jin-luh

  Southern Region Labor Inspection Office Council Of Labor Affairs

• Chen J‐l

  Yuanpei Technol. Coll.

• Su Li-fang

  Department Of Environmental And Occupational Health Medical College National Cheng Kung University

• Tsai P‐j

  Department Of Environmental And Occupational Health Medical College National Cheng Kung University

• Tsai Perng-jy

  Department Of Environmental And Occupational Health Medical College National Cheng Kung University:s

• Tsai Perng-jy

  Department Of Environmental And Occupational Health College Of Medicine National Cheng Kung Universi

• CHEN Jyh-Larng

  Department of Environmental Engineering and Health, Yuanpei University College of Health Science

• TSAI Ching-Lang

  Department of Earth Science, National Cheng Kung University

• LIU Hung-Hsin

  Department of Occupational Safety and Health, Chung Shan Medical University

• LIN Ming-Hsiu

  Institute of Occupational Safety and Health, Council of Labor Affairs

• Tsai Ching-lang

  Department Of Earth Science National Cheng Kung University

• Liu Hung-hsin

  Department Of Occupational Safety And Health Chung Shan Medical University

• Liu Hung-hsin

  Department Of Industrial Safety And Hygiene Chung Hwa College Of Medical Technology

• Lin Ming-hsiu

  Institute Of Occupational Safety And Health Council Of Labor Affairs

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