Cost-Effective Alternatives for Air Sampling

• Ideal for whole air sampling at ppb-ppm levels.
• Select from Tedlar, ALTEF, and multi-layer foil bags in a wide range of sizes.
• Extensive line of sampling accessories and replacement parts makes it quick and convenient to get fully equipped.

Gas sampling bags are whole air sampling devices useful for sampling part-per-billion (ppb) to part-permillion (ppm) levels of volatile organic compounds (VOCs) and permanent gases. Sampling bags can be a cost-effective alternative to canisters and solvent/thermal desorption tubes and are appropriate for many applications, including industrial hygiene, landfill/biogas, ambient air, indoor air, and stationary source testing. Compare gas sampling bags to other techniques and then choose the bag that’s right for your air sampling program.

General Guidelines for Bag Sampling

Follow these basic considerations for trouble-free air sampling using gas sampling bags.

Before Sampling

• Store unused bags in a clean environment, sealed in an outer bag to prevent adsorption of contaminants.
• Preclean bags before use by flushing with high-purity nitrogen.
• Leak rate should not exceed 0.1″ Hg/min

During Sampling

• Do not fill bags more than 80%
• Be sure the PTFE tubing used for bag connection is clean.
• Use a vacuum box sampler for direct bag filling in order to avoid contamination from a sampling pump
• 3 L/min is a typical flow rate.

After Sampling

• Bags are intended for single use due to potential sample adsorption onto the bag film.
• Hold times are typically 48 hours unless validation study demonstrates longer stability.
• Protect samples from direct sunlight and store above 0 °C to prevent condensation.
• Transport in rigid, opaque container to prevent bag puncture; do not ship by air unless samples will be kept in a pressurized area.