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Environmental Technology Listing
Title of Listing:
In Situ Headspace Analysis
Category:
Characterization Technologies
Subcategory:
 *Soil, All Listings
Media:
Soil
Contaminants:
VOCs
Web Site:
Email:
Technology Description:

In Situ Headspace Analysis (ISHA) is a quantitative analysis method for measuring concentrations of volatile organic compounds (VOCs) in unsaturated soil. The technology consists of both the analytical equipment, which is installed on a cone penetrometer testing (CPT) rig, and the methodology for making the measurements. The principle is based on standard, static headspace laboratory analysis of VOCs in soil except, as the name implies, the headspace is measured in situ rather than in soil samples. The scientific principle upon which ISHA based is that, in a soil contaminated with a VOC such as benzene or TCE, there exists a partition coefficient that describes that ratio of the concentration of the VOC in the gas phase and the concentration of the VOC in the condensed phases (adsorbed onto soil and organic carbon, dissolved in soil moisture, etc.). Numerous studies have confirmed that such partition coefficients exists and are easily measured. The key equipment innovation upon which ISHA is based is HFA's patented vapor collection system, which provides rapid decontamination of the sampling line between samples without handling or replacing the line. Laboratory calibration and QA/QC procedures are identical to or analogous to those performed in the laboratory. Compared to laboratory analysis of soil samples, ISHA produces more defensible results, is much faster than a mobile laboratory, and is much less expensive than laboratory analysis.
Performance Status/
Limitations:

The primary limitation of ISHA is the depth capability of CPT. Although CPT can penetrate to depths of up to 200 fbg, the typical working depth in normally consolidated soils 50-150 fbg. CPT will be refused in bedrock, coarse gravels, and highly consolidated soils. ISHA may also encounter difficulty in collecting headspace from low permeability and/or high moisture such as clays.
Topics
Chemicals, Organics, Technologies, Characterization
Additional Topics/Tags/Keywords
VOCs, Soil, Headspace

Organization:
Holguin, Fahan, and Associates, Inc.
Address:
143 South Figueroa Street
Phone:
DescriptionNumber
City:
Ventura
1.
Primary (805) 652-0219
State/Province/Territory:
CA
2.
Zip/Postal Code:
93001
3.
Country:
United States
4.
Fax:(805) 652-0793
Branch Locations: