A simple method for detecting breakthroughs in used chemical cartridges

Area of Science:

• Industrial Hygiene
• Analytical Chemistry
• Occupational Safety

Background:

• Chemical cartridges are crucial for protecting workers from organic solvent vapors.
• Determining the end of service life for these cartridges is essential for effective respiratory protection.
• Current methods for assessing cartridge service life can be complex or time-consuming.

Purpose of the Study:

• To develop and validate a simple gas detector tube method for assessing chemical cartridge service life.
• To compare the effectiveness of gas detector tubes against gas chromatography (GC) for breakthrough detection.
• To evaluate the practical application of this method in real-world industrial settings.

Main Methods:

• Laboratory experiments involving breakthrough time determination for six organic solvents using GC and gas detector tubes.
• Field study measuring carbon disulfide (CS2) breakthrough in cartridges used by viscose rayon workers.
• Comparison of GC-measured concentrations with gas detector tube readings for migrated vapors.

Main Results:

• Gas detector tube measurements closely approximated final leak concentrations determined by GC in laboratory settings.
• In field surveys, cartridges showing CS2 concentrations above 4 ppm via detector tubes lacked sufficient residual adsorption capacity.
• Gas detector tube measurements of migrated CS2 concentrations proved to be a reliable indicator of remaining cartridge service life.

Conclusions:

• A gas detector tube method offers a simple and practical approach to determine chemical cartridge service life.
• This method provides a reliable assessment of remaining adsorption capacity, enhancing worker safety.
• The validated method can be readily implemented in occupational settings for routine monitoring.