Journal of Korean Society of Occupational and Environmental Hygiene (한국산업보건학회지)

Korean Industrial Hygiene Association (한국산업보건학회)
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Analytical Variability of Airborne Man-made Mineral Fibers by Phase Contrast Microscopy

위상차 현미경법에 의한 인조광물섬유 분석 변이

  • Shin, Yong Chul (Department of Occupational Health and Safety Engineering, Inje University) ;
  • Yi, Gwang Yong (Occupational Safety & Health Research Institute, Korea Occupational Safety and Health Agency) ;
  • Kim, Boowook (Occupational Lung Diseases Institute, Korea Workers Compensation and Welfare Service)
  • 신용철 (인제대학교 보건안전공학과) ;
  • 이광용 (안전보건공단 산업안전보건연구원) ;
  • 김부욱 (근로복지공단 직업성폐질환연구소)
  • Published : 2012.06.30
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Abstract

Objectives: This study was conducted to study the analytical variability of A & B counting rules in counting using a phase contrast microscope airborne fibers collected on filters in man-made mineral or vitreous fibers (MMMFs) industries. Methods: Fibers in filters were counted using A & B rules of NIOSH Method 7400. Intra-counter and inter-counter variations by fiber type and density were obtained. The types of MMMFs analyzed were glass wool fiber, rock wool fiber, slag wool fiber, and refractory ceramic fibers. The densities of fibers classified were <20 $fibers/mm^2,$ 20 - <50 $fibers/mm^2$, 50 - <100 $fibers/mm^2,$ and ${\geq}100$ $fibers/mm^2,$ respectively. Results: Intra-counter relative standard deviations by rule A were 0.084, 0.102, 0.071 for glass wool fibers, rock wool fibers and refractory ceramic fibers, and those by rule B were 0.139, 0.120 and 0.142, respectively. Inter-counter relative standard deviations by rule A were 0.281, 0.296, 0.180 for glass wool fibers, rock wool fibers and refractory ceramic fibers, and those by rule B were 0.396, 0.337 and 0.238, respectively. Conclusions: Intra-counter variation was not different significantly among fiber types (p>0.05), but B rule variation for ceramic fibers approximately 2 times greater than corresponding A rule estimates, and intra-counter and inter-counter variations were higher in the low fiber density.

Keywords

References

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