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

Korean Industrial Hygiene Association (한국산업보건학회)
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Effect of Sampling Cassettes Type used in Sampling of Airborne Carbon Nanotube(CNT) to Electrostatic Loss

공기 중 탄소나노튜브 시료채취 시 사용하는 카세트 종류가 벽면 손실에 미치는 영향

  • Ham, Seunghon (Institute of Health and Environment and Department of Environmental Health and Science, Graduate School of Public Health, Seoul National University) ;
  • Kim, Songha (Institute of Health and Environment and Department of Environmental Health and Science, Graduate School of Public Health, Seoul National University) ;
  • Lee, Jinho (Institute of Health and Environment and Department of Environmental Health and Science, Graduate School of Public Health, Seoul National University) ;
  • Lee, Naroo (Occupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency) ;
  • Yoon, Chungsik (Institute of Health and Environment and Department of Environmental Health and Science, Graduate School of Public Health, Seoul National University)
  • 함승헌 (서울대학교 보건환경연구소, 보건대학원 환경보건학과) ;
  • 김송하 (서울대학교 보건환경연구소, 보건대학원 환경보건학과) ;
  • 이진호 (서울대학교 보건환경연구소, 보건대학원 환경보건학과) ;
  • 이나루 (한국산업안전보건공단 산업안전보건연구원) ;
  • 윤충식 (서울대학교 보건환경연구소, 보건대학원 환경보건학과)
  • Received : 2017.09.02
  • Accepted : 2017.09.25
  • Published : 2017.09.30
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Abstract

Objectives: The purposes of this study were to compare the surface resistance of cassettes according to the material, and to evaluate the wall deposition of carbon nanotubes(CNTs) by electrostatic loss in the inner wall of the cassette. Methods: Surface resistance was measured for three types of cassettes(25 mm polypropylene conductive cowl, 25 mm and 37 mm clear styrene cassettes) with a surface resistance meter. Also, electrostatic wall loss was measured at different weights of CNTs depending on the cassette. CNTs were laid on a weight dish with the cassette for five minutes to provide sufficient time to attach on the wall. Wipe sampling was performed to collect CNTs deposited on the wall and elemental carbon, known as a surrogate for CNTs, was analyzed. Results: The cassette with conductive materials(18% of black carbon) showed the lowest surface resistance($<1.21{\times}10^3{\Omega}$). Cassettes made from clear polystyrene showed the relatively highest surface resistance(25 mm: $10.02{\times}10^9{\Omega}$, 37 mm: $10.59{\times}10^9{\Omega}$). This means that particles are more likely to stick to the internal wall of styrene cassettes due to electrostatic electricity. This may lead to an underestimation of the airborne concentration of CNTs. The experiment showed that EC was not detected when using a 25 mm conductive cowl cassette, while EC was detected at the internal wall of 25 mm and 37 mm polystyrene cassettes. Conclusions: This study confirms that cassettes with a conductive cowl have low surface resistance and are more appropriate for CNT sampling. In addition, this finding could be applied for other types of particulate, especially regarding electrostatic charge and sampling.

Keywords

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