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Reducing exposure levels of immersion washing workers to ortho-phthalaldehyde by improving exhaust systems.
Yamamoto, Shinobu; Hachiya, Yuriko; Goto, Motohide; Takeuchi, Akito; Ishidao, Toru; Hori, Hajime; Miyauchi, Hiroyuki.
Afiliación
  • Yamamoto S; Department of Environmental Measurement and Control, School of Health Sciences, University of Occupational and Environmental Health, Kitakyushu, Japan.
  • Hachiya Y; Department of Occupational and Community Health Nursing, School of Health Sciences, University of Occupational and Environmental Health, Kitakyushu, Japan.
  • Goto M; Department of Occupational Toxicology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Kitakyushu, Japan.
  • Takeuchi A; Osaka Occupational Health Service Center, Japan Industrial Safety and Health Association, Nishi-ku, Japan.
  • Ishidao T; Department of Environmental Measurement and Control, School of Health Sciences, University of Occupational and Environmental Health, Kitakyushu, Japan.
  • Hori H; University of Occupational and Environmental Health, Kitakyushu, Japan.
  • Miyauchi H; Department of Environmental Measurement and Control, School of Health Sciences, University of Occupational and Environmental Health, Kitakyushu, Japan.
J Occup Health ; 66(1)2024 Jan 04.
Article en En | MEDLINE | ID: mdl-38990604
ABSTRACT

OBJECTIVES:

The American Conference of Governmental Industrial Hygienists recommends a threshold limit value-ceiling (TLV-C) of 0.1 ppb for occupational exposure to ortho-phthalaldehyde (OPA) used in washing endoscope probes. To adhere to this extremely low exposure limit, this case study aimed to reduce OPA exposure concentrations of workers during immersion washing of an endoscope probe body. This was achieved by attaching a new duct and hood to the existing ceiling exhaust system.

METHODS:

The type of hood was determined by calculating and comparing the capture velocity obtained by assuming either an exterior or an enclosing hood. Additionally, the effect on improving the working environment was tested before and after the installation of the hood by measuring the OPA vapor concentration.

RESULTS:

The calculated capture velocities of the exterior and enclosing hoods were 0.05 m/s and 0.19 m/s, respectively. Considering the operability, the exterior hood was more appropriate; however, the calculated capture velocity indicated potential inadequacy in meeting the TLV-C requirement, leading to the adoption of the enclosing hood. The OPA vapor concentration in ceiling value measurements taken after the enclosing hood was fitted was reduced to 0.2 ppb, that is, 1/10 of the original concentration.

CONCLUSIONS:

Although the environmental concentration after the improvement still exceeded the TLV-C of 0.1 ppb, this study's findings indicate that even substances with extremely low occupational exposure limits can be managed with appropriate local exhaust ventilation.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ventilación / O-Ftalaldehído / Exposición Profesional / Contaminantes Ocupacionales del Aire Límite: Humans Idioma: En Revista: J Occup Health Asunto de la revista: MEDICINA OCUPACIONAL Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Australia
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ventilación / O-Ftalaldehído / Exposición Profesional / Contaminantes Ocupacionales del Aire Límite: Humans Idioma: En Revista: J Occup Health Asunto de la revista: MEDICINA OCUPACIONAL Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Australia