Single-use sample bags are typically intended for short-term storage (approximately 24–48 hours). Storage for >48 hours is usually not recommended unless validation studies verify longer stability of target analytes. We recommend the following guidelines when 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 a 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.
