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DIRECT TRACE ANALYSIS OF VOLATILE ORGANIC COMPOUNDS IN AIR USING ION TRAP MASS SPECTROMETERS WITH FILTERED NOISE FIELDS
Citation:
Gordon, S., P. Kelly, D. Kenny, AND J. Pleil. DIRECT TRACE ANALYSIS OF VOLATILE ORGANIC COMPOUNDS IN AIR USING ION TRAP MASS SPECTROMETERS WITH FILTERED NOISE FIELDS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/034 (NTIS PB95190484), 1995.
Description:
Two ion trap mass spectrometers and direct air sampling interfaces are being evaluated in the laboratory for monitoring toxic air pollutants in real time. he mass spectrometers are the large, laboratory-based Finnigan MAT ion trap (ITMS) and the compact, field-deployable Teledyne 3DQ Discovery ion trap. oth instruments are equipped with filtered noise field (FNF) technology, which minimizes the effects due to space charging normally associated with ion traps, provides a unique means of isolating individual target compounds in complex mixtures, and permits tandem mass spectrometry (MS/MS) operation for unambiguous characterization of individual compounds with high sensitivity and specificity. he combination direct air sampling/ion trap/FNF systems are being evaluated using a semipermeable tubular membrane interface and an atmospheric sampling glow discharge ionization (ASDI) source to measure selected volatile organic compounds (VOCs) in air continuously in real time. onpolar and polar VOCs are measured at trace levels, using an environmental test chamber as the source of the target compound mixtures at known concentrations. xperiments conducted with the combination systems demonstrate the power of the FNF method and delineate the advantages and disadvantages of the tow direct air sampling interfaces for monitoring VOCs.
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DIRECT TRACE ANALYSIS OF VOLATILE ORGANIC COMPOUNDS IN AIR USING ION TRAP MASS SPECTROMETERS WITH FILTERED NOISE FIELDS