Estimating long-term exposure levels in process-type industries using production rates.

Area of Science:

• Occupational Health
• Industrial Hygiene
• Environmental Science

Background:

• Rotogravure printing plants utilize toluene, a volatile organic compound, posing potential occupational exposure risks.
• Accurate assessment of long-term worker exposure to toluene is crucial for implementing effective control measures.

Purpose of the Study:

• To investigate the correlation between production rate, measured by toluene consumption, and airborne toluene levels in publication rotogravure plants.
• To evaluate the accuracy of estimating long-term worker exposure to toluene based on production data.

Main Methods:

• Continuous area monitoring of airborne toluene concentrations.
• Correlation analysis between toluene consumption (production rate) and measured toluene levels.
• Estimation of worker exposure by combining area concentrations with time-activity data, validated by breathing zone sampling.

Main Results:

• A good correlation was found between estimated and actual worker exposure levels.
• Toluene concentration near presses correlated with toluene consumption under stable conditions.
• Correlation varied between plants, with some showing a reasonably high association and others a low one.

Conclusions:

• Estimating long-term toluene exposure using production rates can provide insights into exposure determinants.
• The accuracy of this estimation method is influenced by process parameters and plant-specific conditions.
• Further investigation is needed to refine this approach for reliable occupational exposure assessment.