Atmospheric pressure helium rf plasma source for atomic and molecular mass spectrometry

Abstract

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Atmospheric pressure helium rf plasma source for atomic and molecular mass spectrometry Guevremont, R.; Sturgeon, R. E.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=5765078&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=5765078&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1039/a903914gJournal of Analytical Atomic Spectrometry, 15, 1, pp. 37-42, 2000-01-07 Full PaperAtmospheric pressure helium rf plasma source for atomic and molecular mass spectrometry A capacitively coupled low power atmospheric pressure rf He plasma established within a thermostated cylindrical steel block serves as a source for the generation of molecular and atomic ions for mass spectral analysis. Volatile analytes separated by gas chromatography are admitted to the source through a coaxial rfpowered center electrode. Variation of the forward power, in the range 5±100 W, and the position of the plasma relative to the differentially pumped extraction ori®ce of the mass spectrometer, permits control over the relative intensities of parent and daughter ion products of the decomposition of organometallic compounds introduced into the source. Spectral features range from simple response from atomic ions to the detection of the parent molecular compounds and combinations of the two between the extremes of operating conditions. Ferrocene, triethyllead chloride and ethylmercury chloride were used to illustrate the application of the technique.

Use of Ar–He mixed gas plasmas for furnace atomisation plasma ionisation mass spectrometry (FAPIMS)

“…As a result, only a portion of the gas introduced into the work-head enters the plasma volume. A more ef®cient, direct sample introduction method for gas ef¯uents has earlier been described by Jimenez and Sturgeon 19 and successfully utilised by Sturgeon and Guevremont 8 with MS detection.…”

“…It is anticipated that such improvements would be relevant to analogous atmospheric pressure He rf plasma sources used for the MS detection of atomic and molecular ions in gas ef¯uents. 8 One promising new approach to improving the overall sensitivity and capability of the FAPIMS source is through the use of Ar±He mixed gas plasmas. Sun and Sturgeon 9,10 have demonstrated that emission intensities for a number of atom and ion lines are signi®cantly enhanced when Ar±He plasmas are sustained within the FAPES source.…”

Species specific isotope dilution calibration for determination of mercury species by gas chromatography coupled to inductively coupled plasma- or furnace atomisation plasma ionisation-mass spectrometry

“…The GC-ICP-MS column temperature program was used with the addition of programmed valve timing to vent the toluene solvent. Within the FAPIMS workhead, the original 1 mm diameter graphite rod electrode and mount was replaced by a system analogous to that previously described 14,15 where the transfer capillary was passed directly into the base of a hollow, perforated nickel rf electrode. Purge gas, introduced well upstream of the mouth of the transfer capillary,¯owed concurrently with ef¯uent gas inside the transfer capillary and ensured that eluent from the capillary was¯ushed ef®ciently from the inside of the nickel rf electrode to the plasma.…”

“…11±14 Furnace atomisation plasma ionisation mass spectrometry (FAPIMS) has the potential to be operated as a robust elemental ion source and as a softer generator of molecular ions. 15 The thermal temperature of the source and the rf power applied to the plasma may be varied to produce conditions suitable for the production of the desired ions. 15 The importance of species speci®c mercury species determination in natural gas condensate, amongst other petroleum products, was discussed in a 1999 review by Wilhelm and Bloom.…”

“…15 The thermal temperature of the source and the rf power applied to the plasma may be varied to produce conditions suitable for the production of the desired ions. 15 The importance of species speci®c mercury species determination in natural gas condensate, amongst other petroleum products, was discussed in a 1999 review by Wilhelm and Bloom. 16 The different chemical and physical properties of the species can affect the ef®ciency of methods for the removal of mercury from hydrocarbon products, depending on their species content.…”