navbar.gif (6338 bytes)

5 EXTRACTION METHODS

5.4 PURGE and TRAP


Use: Extraction of VOCs from soil and water samples.

Description:

Purge and trap techniques involve the forcing of a gas (usually helium) through a sample of water or soil slurry, which entrains the VOCs. The entrained volatiles can be fed directly into the analytical instrument or can be used in combination with the sorbent trap to concentrate samples for later thermal extraction.

Analytes:

1. Non-Halogenated VOCs 3. Halogenated VOCs

Media:

Soil: Ground Water: Surface Water: Gas/Air:
MINIMUM MINIMUM MINIMUM Not Applicable
Maximum Depth: Not Applicable.
Production Rate: Sample is available quickly.
Investigation Derived Waste Volume: Medium volume of waste.
Technology Status: Commercially available and routinely used field technology.
Certification/Verification: Technology has not participated in CalEPA certification and/or CSCT verification program.
Relative Cost per Sample: Mid-range expense.

Limitations:

EPA Methods:

5030B Purge-and-Trap for Aqueous Samples.
5035 Closed-System Purge-and-Trap and Extraction for Volatile Organics in Soil and Waste Samples.

Previous Page Sample Access/Collection Matrix Sample Analysis Matrix Home Areas of Interest Next Page