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Workers' exposure to isocyanates.

J Lesage¹, N Goyer, F Desjardins

¹Institut de recherche en santé et en sécurité du travail, Montréal, Québec, Canada.

American Industrial Hygiene Association Journal

|February 1, 1992

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A new model and sampling system accurately measure airborne isocyanates (monomers and oligomers) in industrial settings. This advancement improves occupational exposure assessment for worker safety.

Area of Science:

Occupational Health and Safety
Industrial Hygiene
Analytical Chemistry

Background:

Isocyanates are prevalent in industrial settings, posing significant occupational health risks.
Existing methods for assessing isocyanate exposure may not fully characterize airborne physical forms (monomers vs. oligomers).

Purpose of the Study:

To propose a comprehensive exposure model for isocyanates.
To develop and validate a novel sampling and analytical system for determining airborne isocyanate characteristics.

Main Methods:

Developed a dual-filter sampling system with derivatization for capturing aerosol and vapor phases.
Utilized 9-(N-methylaminomethyl) anthracene (MAMA) for isocyanate derivatization.
Validated the system in laboratory settings and field trials across various industries.

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Main Results:

The new system reduces sampling time to 15 minutes with a detection limit of 1.0 µg/m³ for TDI, HDI, and MDI.
Demonstrated effectiveness in measuring both monomeric and oligomeric isocyanates.
Field studies in foam plants, paint shops, and foundries confirmed the model's utility and revealed industry-specific exposure patterns.

Conclusions:

The proposed model and analytical system provide a robust method for assessing occupational isocyanate exposure.
Findings highlight the importance of considering both monomeric and oligomeric forms in different industrial environments.
The system offers improved accuracy and efficiency for industrial hygiene surveys.