|Use:||GC/MS is a hybrid technique that combines the separation capability of the gas
chromatograph (GC) (see 9.1.1), the analytical capability of the
mass spectrometer (MS) (see 9.1.2), and the capability to provide
real-time, on-site data. NOTE: Due to instability of certain explosives, GC/MS is
not a preferred option. However, low concentrations of thermally sensitive
explosives can be safely analyzed using proper procedures.
See 6.2.8 for use with VOCs, SVOCs, and pesticides.
GC/MS systems allow better resolution of components in complex mixtures than mass spectrometry alone and are most commonly used for unequivocal identification of hazardous compounds. A GC is essentially a highly efficient device for separating a complex mixture into individual components. When a mixture of components is injected into a GC equipped with an appropriate column and carrier gas, the components travel through the column at different rates. A mass spectrometer (MS) located at the end of the column can then analyze each component separately as it leaves the column. In essence, the GC allows the mass spectrometer to analyze a complex mixture as a series of pure components.
|Requires extraction to liquid or gas phase||Requires extraction to liquid or gas phase||BETTER|
|Selectivity:||Technique measures the specific contaminant directly.|
|Susceptibility to Interference:||Low.|
|Detection Limits :||10-100 ppm (soil); 0.5-10 ppm (water).|
|Turnaround Time per Sample:||Hours (turnaround time may increase due to calibration requirements).|
|Screen/Identify||Characterize Concentration/Extent||Cleanup Performance||Long-Term Monitoring|
|Quantitative Data Capability:||Produces quantitative data.|
|Technology Status:||Commercially available technology with moderate field experience.|
|Certification/Verification:||Technology has not participated in CalEPA certification and/or CSCT verification program.|
|Relative Cost per Analysis:||Most expensive.|
ASTM Standards/EPA Methods:
No applicable ASTM standards or EPA methods are cited for this technology.
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