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Exposure of Laboratory Workers to Airborne Nanoparticles during Acid Treatments on Engineered Carbon Nanotubes
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 Title & Authors
Exposure of Laboratory Workers to Airborne Nanoparticles during Acid Treatments on Engineered Carbon Nanotubes
Ha, Ju-Hyun; Shin, Yong-Chul; Lee, Seung-Chul; Paik, Samuel Y.; Kim, Boo-Wook; Choi, Byung-Soon; Kang, Dong-Mug; Paik, Nam-Won;
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 Abstract
This study was performed to investigate laboratory workers' exposures to airborne nanoparticles at a university laboratory where acid treatment experiments were conducted on the surfaces of engineered carbon nanotubes (CNTs). The surface area concentrations, number concentrations, and mass concentrations of airborne nanoparticles were measured at personal breathing zones (PBZs) for various tasks using direct reading instruments. For all three metrics, airborne nanoparticle concentrations during the experiments were higher than background levels measured before and after the experiments for all three metrics. Among the various tasks that were performed as part of these experiments, one task that involved filtering a mixture of acid and CNTs showed the highest concentrations in all three metrics, with concentrations of /cc, 24320 pt/cc, and , respectively. Nanoparticle surface area concentrations measured at a representative area fluctuated with those at the PBZs in the laboratory. This result indicates that nanoparticles generated during the experiments were not just limited to the PBZs of the workers but were also present throughout the room, potentially exposing co-located workers. CNTs were detected by a transmission electron microscope in an air sample collected while handling the CNTs. All the tasks were performed inside fume hoods, with the sliding sashes open to their required heights. It was noted that the capture velocities of the fume hoods were much lower than the American National Standards Institute (ANSI)'s recommendation level (0.4 to 0.6 m/s). In conclusion, this study showed that, due to inadequate control, laboratory researchers performing acid treatment experiments on surfaces of CNTs were exposed to airborne nanoparticles generated during the tasks.
 Keywords
carbon nanotubes;CNTs;airborne nanoparticle;laboratory;exposure;control;
 Language
Korean
 Cited by
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탄소나노튜브 필름 제조 실험실의 세부작업별 공기 중 나노입자 노출 농도,하주현;신용철;

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나노물질의 측정전략의 주요 쟁점,윤충식;

한국환경보건학회지, 2011. vol.37. 1, pp.73-79 crossref(new window)
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용접 및 연마에서 발생되는 나노입자 특성 평가 : 수농도 및 입경분포 분석,김부욱;김현욱;

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A Review on Chemical Exposure and Related Health Risks in Laboratory Workers, Korean Journal of Environmental Health Sciences, 2010, 36, 6, 441  crossref(new windwow)
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