Record Display for the EPA National Library Catalog
RECORD NUMBER: 29 OF 680
|OLS Field Name||OLS Field Data|
|Main Title||Ambient air non-methane hydrocarbon monitor /|
|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,|
|Report Number||EPA/600/2-80/201; U-6624; EPA-68-02-2776|
|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|
|Collation||49 pages ; 28 cm|
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.
Caption title. "December 1980." "EPA-600/2-80-201." Microfiche.