TE-PAS-DD Passive Air Sampler for Direct Deposition Collection SKU: TE-PAS-DD

Passive Air Sampler for Persistent Organic Pollutant Monitoring

The TE-PAS-DD (Passive Air Sampler - Direct Deposition) is designed for collection of persistent organic pollutants (POPs) in ambient air. These instruments can be deployed quickly, easily, and in any location without requiring electricity or routine maintenance. The PAS-DD design captures larger depositing particles with elevated effective sampling rates up to ~4 times higher than standard PUF-PAS systems.

Operating Principle

The TE-PAS-DD utilizes a polyurethane foam disk (PUF) which is uniformly porous to allow gaseous chemicals to penetrate. The PUF disk is mounted inside two stainless steel bowls to buffer the air flow to the disk and to shield it from precipitation and light. The porous nature of PUF helps to ensure that particles are entrained in the PUF matrix once deposited and therefore are less susceptible to resuspension in air.

Uptake profiles remain linear over extended deployment periods (up to 56 days), confirming the ability to provide time-integrated measurements of airborne trace metals and organic compounds.

Key Specifications

• Equivalent air sampling rate of ~4 m³/day for gas-phase and particle-phase compounds
• Enhanced collection of larger depositing particles with sampling rates up to 4× higher than standard PUF-PAS
• Stainless steel construction for durability in harsh environments
• No electrical power required
• Maintenance-free operation

Compatibility and Required Components

The TE-PAS-DD includes a direct deposition sampler and stainless steel L bracket for mounting. Operation requires TE-1014 PUF Disks (12" × 5-1/2" unwashed polyurethane foam substrates) for sample collection.

Compatible with analytical protocols including EPA Compendium Method TO-13A for polycyclic aromatic hydrocarbons and other semi-volatile organic compounds.

Sample Collection and Analysis

The samplers with polyurethane foam plugs are deployed and collect the POPs in ambient air. The PUF disks are later removed from the device and transported to a lab for further analysis. PUF-PAS are frequently used to measure persistent organic pollutants (POPs) in ambient air, providing effective sampling volumes for gas-phase chemical compounds.

Deployment periods are flexible based on monitoring requirements and local conditions. Sampling rate calculations can be performed using publicly available hourly meteorological data, physical-chemical properties of target compounds, and deployment dates.

Applications

• Ambient air monitoring for POPs including PCBs, PAHs, and organochlorine pesticides
• Urban-rural trend assessment for persistent organic pollutants
• Source characterization and atmospheric transport studies
• Environmental compliance monitoring
• Assessment of toxicity and potential adverse human health impacts from atmospheric particulate matter
• Global monitoring networks for atmospheric pollutant tracking

The TE-PAS-DD provides a cost-effective solution for spatial investigations of air pollutants where active sampling infrastructure is impractical or unavailable.