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

Korean Industrial Hygiene Association (한국산업보건학회)
권호 표지

Characterization of Nanoparticles from Welding and Grinding Processes: Evaluation of Number Concentration and Size Distribution

용접 및 연마에서 발생되는 나노입자 특성 평가 : 수농도 및 입경분포 분석

  • Kim, Boowook (Occupational Lung Diseases Institute, Korea Workers' Compensation and Welfare Service) ;
  • Kim, Hyunwook (Department of Preventive Medicine, College of Medicine, The Catholic University of Korea)
  • 김부욱 (근로복지공단 직업성폐질환연구소) ;
  • 김현욱 (가톨릭대학교 의과대학 예방의학교실)
  • Published : 2012.09.30
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Abstract

Objectives: This study aimed to characterize the nanoparticles produced by welding and grinding processes. Methods: The number concentrations of particles were mapped to determine the distribution of welding fumes in a workplace atmosphere using a hand-held condensation particle counter. An electrical low-pressure impactor was used for measuring the number concentration and particle size distribution. Results: High number concentrations were found around arc cutting and welding (grinding) processes. In the worker's breathing zone, the mean number concentration was 655,000 particles/cm3 and the count median diameter (CMD) was 84 nm with several multi peak distributions (~20, 70, 300 nm). However, at a distance of 3 m from the welding position, the number concentration decreased to 153,000 particles/cm3 with a 70 nm single peak size distribution. During a grinding process, peaks with high concentrations of nanoparticles were temporarily observed. The mean number concentration was 1,520,000 particles/cm3, and the CMD was 30 nm. Nanoparticles (<100 nm) made up 58% and 92% of the aerosols produced by welding and grinding processes, respectively.

Keywords

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