EPA Method 8265

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EPA Method 8265:
VOLATILE ORGANIC COMPOUNDS IN WATER, SOIL, SOIL GAS, AND AIR BY DIRECT SAMPLING ION TRAP MASS SPECTROMETRY (DSITMS)

Summary:
Volatile organic compounds (VOCs) are purged or desorbed from liquid or solid samples, and conveyed directly into the mass spectrometer ion source by means of a stream of helium (or air and/or other gas for suitable mass spectrometers), where the compounds are ionized by electron impact (EI) and/or chemical ionization (CI). Full-scan mass spectra are acquired continuously and are used to identify the VOCs. Characteristic ions unique to the target analytes are monitored for a selected period of time to establish an accumulated (integrated or averaged) response and the response is compared to that from a comparably generated calibration factor for quantitation. Selective ionization, multiple stage/mass spectrometry (MS/MS), and spectral subtraction may be employed in cases where additional selectivity is required.

Scope:
This method uses direct sampling ion trap mass spectrometry (DSITMS) for the rapid quantitative measurement, continuous real-time monitoring, and qualitative and quantitative preliminary screening of volatile organic compounds (VOCs) in water, soil, soil gas, and air. DSITMS introduces sample materials directly into an ion trap mass spectrometer by means of a simple interface (such as a capillary restrictor). There is little if any sample preparation and no chromatographic separation. The response of the instrument to analytes in a sample is nearly instantaneous. In addition, the instrument is field transportable, rugged, and relatively easy to operate and maintain.

Report Number:
SW-846