| Use: | Headspace extraction methods are an extremely simple technique used to collect VOCs. |
Description:
Gas headspace extraction involves the use of dead space to collect gases that are moving through water or soil, or from a solid or liquid phase to a gaseous phase. This can involve placement of water or soil in a container that is partly filled with air (headspace), and collecting a sample of the headspace gas (usually with a syringe once the vapors in the sample have equilibrated with the headspace). Since not all vapors are likely to degas the first time, multiple headspace extraction is sometimes used.
Analytes:
| 1. Non-Halogenated VOCs | 3. Halogenated VOCs |
Media:
| Soil: | Ground Water: | Surface Water: | Gas/Air: |
| MODERATE | MODERATE | MODERATE | 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: | Least expensive. |
Limitations:
ASTM Standards:
| D 3871 - 84 | Test Method for Purgeable Organic Compounds in Water using Headspace Sampling. |
EPA Methods:
| 5021 | Volatile Organic Compounds in Soils and Other Solid Matrices Using Equilibrium Headspace Analysis. |
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