Record Display for the EPA National Library Catalog
RECORD NUMBER: 6 OF 103Main Title | Ambient air non-methane hydrocarbon monitor / | |||||||||||
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Author | Burch, Darrell, E. | |||||||||||
CORP Author | Ford Aerospace and Communications Corp., Newport Beach, CA. Aeronutronic Div.;Environmental Sciences Research Lab., Research Triangle Park, NC. | |||||||||||
Publisher | U.S. Environmental Potection Agency, Health Effects Research Laboratory, | |||||||||||
Year Published | 1980 | |||||||||||
Report Number | EPA/600/2-80/201; U-6624; EPA-68-02-2776 | |||||||||||
Stock Number | PB81-120008 | |||||||||||
Subjects | Hydrocarbons--Measurement ; Air--Pollution--Measurement ; Air pollution control industry--United States | |||||||||||
Additional Subjects | Air pollution ; Monitors ; Hydrocarbons ; Concentration(Composition) ; Sampling ; Performance evaluation ; Design criteria ; Laboratory equipment ; Water ; Flame ionization detectors ; Air pollution detection | |||||||||||
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Collation | 49 pages ; 28 cm | |||||||||||
Abstract | A monitor has been developed with adequate sensitivity and accuracy to measure continuously the concentration of non-methane hydrocarbons (NMHC) in ambient air. The monitor consists of pump and manifold system along with two basic instruments, a methane monitor and a flame-ionization detector (FID). The methane monitor, which employs gas-filter correlation techniques, makes use of the infrared absorption characteristics of methane to measure its concentration. A slight interference in the measurement of methane by H2O vapor in the sample air is accounted for from the simultaneous measurement of the H2O concentration. The flame-ionization detector measures the concentration of the total hydrocarbons (THC), including methane. The concentration of non-methane hydrocarbons is found by subtracting the methane concentration from the THC concentration. The noise-equivalent concentrations (peak-to-peak) of the methane monitor and the FID are approximately 50 ppb and 5 ppb of carbon, respectively. The estimated uncertainty in the measurement of a typical low-level NMHC concentration is between 20 ppb and 50 ppb. Concentrations as high as approximately 70 ppm can be measured. |
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Notes | Caption title. "December 1980." "EPA-600/2-80-201." Microfiche. |