Diisocyanate Exposure Assessment in Occupational Health

Diisocyanates are highly reactive chemicals extensively used in the manufacture of polyurethanes, coatings, adhesives and elastomers. Occupational exposure arises predominantly through inhalation of vapours or aerosols and via dermal contact with uncured products. These compounds are potent respiratory sensitizers and a leading cause of occupational asthma. Assessment of exposure requires an integrated approach combining air measurements, biological monitoring and exposure modelling. Air sampling methods measure airborne concentrations of specific diisocyanates or their oligomers, while biomonitoring typically relies on quantification of urinary or blood metabolites following chemical hydrolysis. Physiologically based kinetic models have been developed to translate external exposures into predicted biomarker levels, accounting for interindividual variability and exposure routes. Health impact assessments use reconstructed exposure data to estimate long-term risks of bronchial hyperresponsiveness and sensitisation. Regulatory frameworks commonly set occupational exposure limits for inhalation and recommend dermal protection measures to mitigate risk. Recent advances include refined analytical methods with enhanced sensitivity, improved sampling strategies for combined inhalation and dermal pathways, and harmonised reporting standards. Effective control also depends on engineering ventilation, personal protective equipment and worker training. A comprehensive exposure assessment not only identifies high-risk operations but also guides the design of preventive interventions, contributing to the global effort to reduce the burden of isocyanate-related respiratory disease.

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Diisocyanate Exposure Assessment in Occupational Health publication trend

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Technical terms

Diisocyanate: Reactive organic compound with two isocyanate groups used in polyurethane production and known respiratory sensitiser.

Physiologically Based Kinetic (PBK) Model: Computational framework simulating absorption, distribution, metabolism and excretion of chemicals to predict internal dose metrics.

Biomonitoring: Measurement of chemical metabolites or adducts in biological matrices to assess individual exposure and internal dose.

Occupational Asthma: Asthmatic condition induced by workplace exposures, characterised by airway hyperresponsiveness and reversible airflow obstruction.

References

1. A physiologically-based kinetic (PBK) model for work-related diisocyanate exposure: Relevance for the design and reporting of biomonitoring studies. Environment International (2023).
2. Occupational Exposure and Health Impact Assessment of Diisocyanates in Finland. Toxics (2023).
3. Occupational Exposure to Diisocyanates in the European Union. Annals of Work Exposures and Health (2021).
4. Detection techniques for air-borne isocyanates based on fluorescent derivatizing agents. Environmental Science Atmospheres (2022).