Assessment of Workplace Air Concentrations of Indium Dust in an Indium‐recycling Plant

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  • Miyauchi Hiroyuki
    The Association of Industrial Health, Japan
  • Minozoe Aoi
    The Association of Industrial Health, Japan
  • Tanaka Shigeru
    Department of Public Health, Graduate School of Human Life Science, Jumonji University, Japan
  • Tanaka Akiyo
    Department of Environmental Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
  • Hirata Miyuki
    Department of Environmental Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
  • Nakaza Masahiro
    Department of Public Health, School of Allied Health Science, Kitasato University, Japan
  • Arito Heihachiro
    Occupational Health Research and Development Center, Japan Industrial Safety and Health Association, Japan
  • Eitaki Yoko
    Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Japan
  • Nakano Makiko
    Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Japan
  • Omae Kazuyuki
    Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Japan

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  • Assessment of Workplace Air Concentrations of Indium Dust in an Indium-recycling Plant

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Objectives: Suspended indium dust in an indium-recycling plant was quantified, in order to improve the work environment and to reduce workers’ exposure to the dust. Methods: Assessment of indium dust in the workplace air by multipoint area sampling and personal breathing zone sampling was conducted twice in 2004 and 2008. Results: In 2004, all recycling processes except for purity analysis were classified into control class III according to the 2004 Notification. Two out of 5 workers were exposed to total dust with indium concentrations exceeding the ACGIH’s TLV-TWA of 0.1 mg In/m3. In 2008, the indium-contaminated workplace air was improved by local exhaust ventilation systems installed in some processes, resulting in control class I. According to the 2010 Technical Guideline, however, all the processes were classified into stage II or III, indicating that the first assessment value or Measurement B-based concentrations exceeded the acceptable exposure concentration limit of 0.0003 mg In/m3 of respirabe dust. Exposure of almost all the workers to indium dust was below the TLV-TWA. Conclusions: The first field survey showed that almost all workplaces were classified into control class III, and that some workers were exposed to dust with indium concentrations exceeding the TLV-TWA. It was found in the second survey that workplace air contamination was improved by the local exhaust ventilation system, but was not reduced sufficiently to a level that meets the new Guideline.

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