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Sampling of respirable isocyanate particles.

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A new denuder impactor (DI) sampler effectively measures airborne isocyanate exposure across various particle sizes. This advanced tool shows reliable performance, unaffected by humidity, and is crucial for understanding nanoparticle health risks.

Keywords:
DBAaerosolair samplingdenuderimpactorisocyanaterespirable

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Area of Science:

  • Environmental Science and Engineering
  • Occupational Health and Safety
  • Analytical Chemistry

Background:

  • Isocyanates are significant respiratory sensitizers, and understanding their airborne exposure is critical for occupational health.
  • Characterizing isocyanates in different particle size fractions is essential for assessing inhalation risks and potential allergic reactions.
  • Existing sampling methods may have limitations in comprehensively capturing both gaseous and particulate isocyanates across size ranges.

Purpose of the Study:

  • To develop and evaluate an advanced denuder impactor (DI) sampler for characterizing airborne isocyanate exposure in specific particle size fractions.
  • To assess the performance and reliability of the DI sampler under controlled environmental conditions.
  • To investigate the particle-size distribution of isocyanates and its influencing factors.

Main Methods:

  • Development of a novel denuder impactor sampler with 12 denuder tubes and 4 impaction stages (cut-off d50: 9.5, 4, 2.5, 1 µm) plus an end filter.
  • Impregnation of collecting parts with di-n-butylamine (DBA) reagent for isocyanate capture.
  • Generation of standard atmospheres with gaseous and particulate isocyanates (TDI, HDI, IPDI, MDI) in an environmental chamber; particle size analysis using a scanning mobility particle sizer (SMPS).

Main Results:

  • The DI sampler demonstrated effective collection of isocyanates across multiple particle size fractions, with low sample losses.
  • Sampler performance was robust and largely unaffected by humidity variations.
  • Observed particle distributions were influenced by humidity and ageing, with significant differences compared to solely NaCl or MDI presence.

Conclusions:

  • The developed DI sampler is a reliable and advanced tool for assessing airborne isocyanate exposure in various particle sizes.
  • The findings highlight the importance of considering particle size and environmental factors in isocyanate exposure assessments.
  • The study underscores the biological relevance of investigating isocyanate nanoparticles due to their potential to reach lower airways and trigger allergic responses.