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SERVICES |
RULE 1176 |
AND RESOURCE |
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Laboratory Services Description
(Items 5, 6, 7 and 8)
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Methods: EPA 3C Detector: GC-TCD Fixed gases such as oxygen, nitrogen, carbon dioxide, methane, helium, neon, argon, krypton, and hydrogen, etc., are analyzed using a gas chromatograph with a thermal conductivity detector. Detection limits for various fixed gases range from 100 ppmv to 500 ppmv. |
Methods: - Detector: GC/NPD This is a specific technique for all organic compounds containing nitrogen or phosphorus atoms in their structure. Using this technique, this class of pollutants can easily be distinguished from other organic compounds. |
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Methods: TO-14, and CARB 410 Detector: GC-PID Aromatic hydrocarbons (i.e., benzene, toluene, xylenes and ethyl benzene) are analyzed using HP5890 Series II gas chromatographs equipped with O/I photoionization detectors. Our laboratory has two GC/PID Systems -- one for ambient air and the other for source samples. One of these systems is also equipped with a cryogenic preconcentration device to further lower the detection limits below one part per billion (1 ppbv). |
Methods: TO-14, CARB 422 Detector: GC/ECD Chlorinated hydrocarbons (i.e., Freons, vinyl chloride, methylene chloride, chloroform, carbon tetrachloride, etc.) are best analyzed using a gas chromatograph equipped with an electron capture detector. This detector is the most sensitive of all detectors for this class of compounds. Our laboratory has two such systems, one for ambient and the other for source type samples. One GC/ECD is equipped with an Entech 7000 cryogenic pre-concentration device to analyze ambient air samples to a detection limit down to 0.1 ppbv. |
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