Development of a continuous aerosol mass concentration measurement device

Area of Science:

• Environmental Engineering
• Occupational Health
• Aerosol Science

Background:

• Personal aerosol sampling is crucial for assessing exposure risks.
• Existing methods can be cumbersome or lack calibration reliability.
• A need exists for a dynamic, real-time aerosol measurement device.

Purpose of the Study:

• To develop and validate a dynamic aerosol mass concentration measurement device for personal sampling.
• To establish the relationship between pressure drop and particle mass concentration.
• To assess the device's performance in laboratory and field settings.

Main Methods:

• Aerosol sampling on a filter with real-time monitoring of pressure drop (ΔP).
• Laboratory validation using a 3.5 µm alumina aerosol in a controlled environment.
• Field testing near an arc-welding station to evaluate performance with sub-micronic particles.

Main Results:

• A linear relationship was established between pressure drop and the mass of particles per unit area of filter.
• The system demonstrated sensitivity to fine aerosols, with mass sensitivity inversely proportional to particle diameter squared.
• Successful field deployment in a mechanical workshop environment confirmed suitability for welding aerosols.

Conclusions:

• The developed dynamic aerosol mass concentration measurement device is effective for personal sampling.
• The device offers advantages in robustness, compactness, calibration reliability, and ease of use.
• Its primary application is for measuring fine, sub-micronic aerosols, particularly those generated during welding processes.