| Use: | Semi-quantitative analysis of PAHs and field screening of benzene, toluene, ethylbenzene, and xylene (BTEX). |
Description:
Synchronous luminescence/fluorescence involves the use of both emission and excitation monochromators to record the luminescence signal which allows greater selectivity in the analysis of environmental samples. Instruments use a sweeping motion, similar to using a metal detector, to scan the site. During this operation, light of a narrow wavelength is projected from the detector head onto the surface being inspected causing excitation fluorescence of the targeted materials. Low level light energy released from the excited material's fluorescence is: (1) filtered to reject unwanted wavelengths of reflected and ambient light, (2) amplified, (3) converted to a video signal, and (4) relayed to the monitor. Light areas displayed on the monitor's darker background indicate the presence of contamination to the operator.
Analytes:
1. Non-Halogenated VOCs
2. Non-Halogenated SVOCs
3. Halogenated VOCs
4. Halogenated SVOCs
Media:
| Soil/Sediment | Water | Gas/Air |
| Requires extraction to a liquid or gas phase | BETTER | ADEQUATE |
| Selectivity: | Technique measures the contaminant indirectly. |
| Susceptibility to Interference: | Medium. |
| Detection Limits : | 100-100 ppb (soil); 1-50 ppb (water). |
| Turnaround Time per Sample: | Hours. |
Applicable To:
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Limitations:
ASTM Standards/EPA Methods:
No applicable ASTM standards or EPA methods are cited for this technology.
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