Solid phase microextraction as a short-term sampling technique for BTEX occupational exposure.

Area of Science:

• Analytical Chemistry
• Occupational Health

Background:

• Solid phase microextraction (SPME) is a versatile technique used across various sample types.
• Conventional methods for assessing worker exposure to volatile organic compounds exist.

Purpose of the Study:

• To evaluate SPME as an alternative method for quantifying worker exposure to benzene, toluene, ethylbenzene, and xylene (BTEX).
• To optimize SPME conditions for field applications and compare its performance against established methods.

Main Methods:

• Investigated polymethylsiloxane-carboxen (PDMS/CAR) as the optimal stationary phase for BTEX sorption.
• Determined analyte uptake rates under varying concentrations, humidity, and airflow velocities using a 75 micrometer PDMS/CAR fiber.
• Compared SPME results with the National Institute of Occupational Safety and Health (NIOSH) Method 1501.

Main Results:

• PDMS/CAR demonstrated superior sorption of BTEX compared to other tested stationary phases.
• Optimized experimental conditions for SPME application in field settings.
• The SPME method successfully quantified BTEX and met the threshold limit value-short term exposure limit (TLV-STEL) for benzene (2.5 ppm).

Conclusions:

• SPME, particularly with PDMS/CAR fibers, is a viable alternative to conventional methods for BTEX exposure assessment.
• The developed SPME method is suitable for field use and adheres to current occupational exposure limits.
• This approach enhances the ability to monitor and manage worker exposure to BTEX.