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DIRECT CALIBRATION OF GC/MS SYSTEMS USING SRM (STANDARD REFERENCE MATERIAL) GAS CYLINDERS
Citation:
Byrd, G., K. Richie, L. Sniegoski, AND E. White. DIRECT CALIBRATION OF GC/MS SYSTEMS USING SRM (STANDARD REFERENCE MATERIAL) GAS CYLINDERS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/4-85/062.
Description:
A cryogenic trapping system has been developed for use in calibrating GC/MS systems for the analysis of volatile organic compounds. This system provides for direct Standard Reference Material (SRM) traceability on data generated on gaseous samples. The cryogenic trap is a coil of stainless steel tubing immersed in a cryogen to trap and preconcentrate organic species present in a gaseous sample. The trap also contains a heated injection port for the addition of isotopically labeled compounds for use in isotope dilution measurements. The first part of this research is concerned with the development of IDMS as an independent method for the quantification of analytes in gaseous samples to be used as standards. Results are presented for the determination of bromobenzene in nitrogen at nominal concentrations of 1 and 25 ppb. In the second part of the research, a calibration curve method was developed for using these standards in auditing the performance of GC/MS systems.