Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Gravimetric Technique for the Preparation of Accurate Trace Organic Gas Standards. Interim Report January-December 1984.
Author Rhoderick, G. C. ; Cuthrell, W. F. ; Zielinski, W. L. ;
CORP Author National Bureau of Standards (NML), Gaithersburg, MD. Gas and Particulate Science Div.;Environmental Monitoring Systems Lab., Research Triangle Park, NC.
Year Published 1987
Report Number EPA/600/4-86/006;
Stock Number PB87-145736
Additional Subjects Gravimetric analysis ; Standards ; Gases ; Hazardous materials ; Trace elements ; Concentration(Composition) ; Gas cylinders ; Organic compounds ; Chemical analysis ; Air pollution detections ; Reference materials ; Volatile organic compounds
Library Call Number Additional Info Location Last
NTIS  PB87-145736 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 12p
An accurate procedure based on micro-gravimetry has been used for the preparation of volatile, hazardous organic chemicals in a nitrogen matrix in pressurized gas cylinders at analyte concentrations ranging from 10 ppb to 10 ppm, by mole. In this technique, the organics of interest are individually weighed into separate glass capillary tubes using a micro-analytical balance. The tubes are sealed, and subsequently broken in a fixed line connected to an evacuated cylinder. A known weight of pre-analyzed matrix gas (nitrogen) is then used to pressurize the cylinder, and the concentrations of the organics are calculated on a molar basis relative to the number of moles of the matrix gas. A number of these gravimetric primary mixtures have been prepared and analytically intercompared using gas chromatography (GC) with flame-ionization detection (FID). Excellent agreement has been found between analyte concentration values prepared gravimetrically and concentration values determined by analysis.