ENVIRONMENTAL SAFETY
OFF-GAS REQUIREMENTS

Determine total hydrocarbons with a total hydrocarbon analyzer. This instrument uses a flame ionization detector system. The sensitivity of this method is 0.45 ppm.

Determine light hydrocarbons (C₁ to C₆) with a gas chromatograph equipped with a Porapak Q stainless steel column, 213 x 0.32 cm, utilizing a flame ionization detector. Flame ionization gas chromatography has a detection limit of 0.1 ppm for many organic compounds.

Determine heavy hydrocarbons (C₆ to C₁₈ with a gas chromatograph using a flame ionization detector and a 183 x 0.32 cm stainless steel column packed with 10 percent OV-101 on Chromosorb W-HF.

Determine total halogenated hydrocarbons with a total halogen analyzer. This instrument uses a ionization type of detector that responds only to halogenated hydrocarbons. The detection limit of this instrument is 0.5 ppm for most halogenated hydrocarbons.

Determine individual halogenated hydrocarbons with a gas chromatograph using an electron capture (Ni₆₃) detector and a 305 x 0.32 cm nickel column packed with Chromosorb 102. Electron capture gas chromatography has a detection limit of 0.01 ppm or better for many halogenated hydrocarbons.

Determine carbon monoxide using a non-dispersive infrared analyzer equipped with a CO detector. The detection limit of this of this instrument is 0.3 ppm.

To identify organic compounds difficult to identify using a gas chromatograph, use a mass spectrometer/gas chromatograph system. The mass spectrometer is a quadrupole instrument with a 55 megabyte computer and an NBS library containing 38,500 compounds. The mass range of the mass spectrometer is 10-

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