Direct sampling ion trap mass spectrometry vs. GC/MS for monitoring VOCs in groundwater
- Oak Ridge National Lab., TN (United States)
Direct Sampling Ion Trap Mass Spectrometry (DSITMS) has been under refinement and demonstration by this laboratory for several years. The general technology is applicable to a wide range of problems which would benefit from high sample throughput, fast availability of results, and relatively low cost per sample analysis when compared with conventional analytical methods. At the present time, DSITMS can be used to determine targeted analytes in air, water, soil, and other media. This is accomplished by equipping an ion trap with a direct inlet system which consists of a splitter, capillary restrictor, and a set of sample inlet modules. The capillary restrictor provides the interface between atmosphere and the vacuum in the ion trap while the splitter enables sampling modules which require high gas flow rates to be used with the system. The sampling modules consist of a purge module for analyzing VOCs in water or soil, a direct air sampling module, and a thermal desorber. These modules are designed to be easily interchanged by means of quick connect fittings and a single electrical cable. In general, the DSITMS sample inlet system works equally well on all of the commercially available ion traps with which it has been tested including the Finnigan MAT ITMS, Finnigan MAT Magnum, Varian Saturn, and the Teledyne 3D-Q. Both the Magnum and 3D-Q instruments have been utilized for field applications as well as laboratory analysis. This particular study is a comparison of DSITMS with a purge and trap GC/MS for compliance monitoring of VOC`s in groundwater.
- OSTI ID:
- 210671
- Report Number(s):
- CONF-9505261-; TRN: 96:001157-0110
- Resource Relation:
- Conference: 43. American Society of Mass Spectrometry (ASMS) conference on mass spectrometry and allied topics, Atlanta, GA (United States), 21-26 May 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the 43rd ASMS conference on mass spectrometry and allied topics; PB: 1411 p.
- Country of Publication:
- United States
- Language:
- English
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