Detection of Carbonaceous Aerosols Released in CNT Workplaces Using an Aethalometer

Jong Bum Kim, Kyung Hwan Kim, Seong Taek Yun, Gwi Nam Bae

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Objectives: Black carbon (BC) originating from various combustion sources has been extensively surveyed to characterize the effects of BC on global warming and human health, and many online monitors are available. In this study, BC was considered as a surrogate for carbon-based nanomaterials in an occupational health study. Methods: Specifically, BC concentrations were monitored continuously with an aethalometer for 24h at four carbon nanotube (CNT) workplaces located in rural, urban, and industrial areas, which had different background air pollution levels. Average BC concentrations for both nonworking (background) and working periods were compared with the recommended exposure limit (REL) of 1 μg m-3 for elemental carbon that was suggested by the National Institute for Occupational Safety and Health (NIOSH). Results: Diurnal variation of BC concentrations indicated that BC measurements corresponded well with carbonaceous aerosols such as vehicle exhaust particles and CNT aerosols. In the rural CNT workplace, the average background BC concentration (0.36 μg m-3) was lower than the REL, but the BC concentration without background correction was higher than the REL during manufacturing hours. In this case, BC measurement is useful to estimate CNT exposure for comparison with the REL. Conversely, in the urban and industrial CNT workplaces, average background BC concentrations (2.05, 1.82, and 2.64 μg m-3) were well above the REL, and during working hours, BC concentrations were substantially higher than the background level at workplace C; however, BC concentrations showed no difference from the background levels at workplaces B and D. In these cases (B and D), it is hard to determine CNT exposure because of the substantial environmental exposures. Conclusion: Most of the urban ambient BC concentrations were above the REL. Therefore, further analysis and test methods for carbonaceous aerosols need to be developed so that the exposure assessment can be easily carried out at CNT workplaces with high background BC levels such as in urban and industrial areas.

Original languageEnglish
Pages (from-to)717-730
Number of pages14
JournalAnnals of Occupational Hygiene
Volume60
Issue number6
DOIs
Publication statusPublished - 2016 Jul 1

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Soot
Carbon Nanotubes
Aerosols
Workplace
Carbon
National Institute for Occupational Safety and Health (U.S.)
Global Warming
Nanostructures
Air Pollution
Environmental Exposure
Occupational Health

Keywords

  • black carbon
  • carbon nanotube
  • elemental carbon
  • exposure assessment
  • nanomaterial
  • workplace

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

Cite this

Detection of Carbonaceous Aerosols Released in CNT Workplaces Using an Aethalometer. / Kim, Jong Bum; Kim, Kyung Hwan; Yun, Seong Taek; Bae, Gwi Nam.

In: Annals of Occupational Hygiene, Vol. 60, No. 6, 01.07.2016, p. 717-730.

Research output: Contribution to journalArticle

Kim, Jong Bum ; Kim, Kyung Hwan ; Yun, Seong Taek ; Bae, Gwi Nam. / Detection of Carbonaceous Aerosols Released in CNT Workplaces Using an Aethalometer. In: Annals of Occupational Hygiene. 2016 ; Vol. 60, No. 6. pp. 717-730.
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abstract = "Objectives: Black carbon (BC) originating from various combustion sources has been extensively surveyed to characterize the effects of BC on global warming and human health, and many online monitors are available. In this study, BC was considered as a surrogate for carbon-based nanomaterials in an occupational health study. Methods: Specifically, BC concentrations were monitored continuously with an aethalometer for 24h at four carbon nanotube (CNT) workplaces located in rural, urban, and industrial areas, which had different background air pollution levels. Average BC concentrations for both nonworking (background) and working periods were compared with the recommended exposure limit (REL) of 1 μg m-3 for elemental carbon that was suggested by the National Institute for Occupational Safety and Health (NIOSH). Results: Diurnal variation of BC concentrations indicated that BC measurements corresponded well with carbonaceous aerosols such as vehicle exhaust particles and CNT aerosols. In the rural CNT workplace, the average background BC concentration (0.36 μg m-3) was lower than the REL, but the BC concentration without background correction was higher than the REL during manufacturing hours. In this case, BC measurement is useful to estimate CNT exposure for comparison with the REL. Conversely, in the urban and industrial CNT workplaces, average background BC concentrations (2.05, 1.82, and 2.64 μg m-3) were well above the REL, and during working hours, BC concentrations were substantially higher than the background level at workplace C; however, BC concentrations showed no difference from the background levels at workplaces B and D. In these cases (B and D), it is hard to determine CNT exposure because of the substantial environmental exposures. Conclusion: Most of the urban ambient BC concentrations were above the REL. Therefore, further analysis and test methods for carbonaceous aerosols need to be developed so that the exposure assessment can be easily carried out at CNT workplaces with high background BC levels such as in urban and industrial areas.",
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AB - Objectives: Black carbon (BC) originating from various combustion sources has been extensively surveyed to characterize the effects of BC on global warming and human health, and many online monitors are available. In this study, BC was considered as a surrogate for carbon-based nanomaterials in an occupational health study. Methods: Specifically, BC concentrations were monitored continuously with an aethalometer for 24h at four carbon nanotube (CNT) workplaces located in rural, urban, and industrial areas, which had different background air pollution levels. Average BC concentrations for both nonworking (background) and working periods were compared with the recommended exposure limit (REL) of 1 μg m-3 for elemental carbon that was suggested by the National Institute for Occupational Safety and Health (NIOSH). Results: Diurnal variation of BC concentrations indicated that BC measurements corresponded well with carbonaceous aerosols such as vehicle exhaust particles and CNT aerosols. In the rural CNT workplace, the average background BC concentration (0.36 μg m-3) was lower than the REL, but the BC concentration without background correction was higher than the REL during manufacturing hours. In this case, BC measurement is useful to estimate CNT exposure for comparison with the REL. Conversely, in the urban and industrial CNT workplaces, average background BC concentrations (2.05, 1.82, and 2.64 μg m-3) were well above the REL, and during working hours, BC concentrations were substantially higher than the background level at workplace C; however, BC concentrations showed no difference from the background levels at workplaces B and D. In these cases (B and D), it is hard to determine CNT exposure because of the substantial environmental exposures. Conclusion: Most of the urban ambient BC concentrations were above the REL. Therefore, further analysis and test methods for carbonaceous aerosols need to be developed so that the exposure assessment can be easily carried out at CNT workplaces with high background BC levels such as in urban and industrial areas.

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