Investigations Into the Response Mechanism of the Gas Chromatographic Thermionic Ionization Detector Part I. Mass Spectral Studies

Bombick, D.D.; Allison, John

doi:10.1093/chromsci/27.10.612

Cited by 14 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Application of a positive voltage bias to the collector facilitates transfer of ion current from the filament to the collector. Previous studies with thermionic detectors suggested that the heated filament induces a combination of gas-phase and surface ionization processes, the relative importance of which depends on the composition of the filament coating (Patterson, 1982;van de Weijer et al, 1988;Bombick and Allison, 1989). Incorporating alkali metal in the surface coating reduces the work function of the surface, and was empirically determined to yield sensitive, selective detection for N and phosphorous (P)-containing analytes (Bombick and Allison, 1989).…”

Section: Overview Of the Ftdmentioning

confidence: 99%

“…Previous studies with thermionic detectors suggested that the heated filament induces a combination of gas-phase and surface ionization processes, the relative importance of which depends on the composition of the filament coating (Patterson, 1982;van de Weijer et al, 1988;Bombick and Allison, 1989). Incorporating alkali metal in the surface coating reduces the work function of the surface, and was empirically determined to yield sensitive, selective detection for N and phosphorous (P)-containing analytes (Bombick and Allison, 1989). The H 2 and air supplied to the detector participate in the ionization chemistry and partially control selectivity and sensitivity (c.f., Bombick and Allison, 1989;Shimadzu Corporation, 2004).…”

Section: Overview Of the Ftdmentioning

confidence: 99%

“…Incorporating alkali metal in the surface coating reduces the work function of the surface, and was empirically determined to yield sensitive, selective detection for N and phosphorous (P)-containing analytes (Bombick and Allison, 1989). The H 2 and air supplied to the detector participate in the ionization chemistry and partially control selectivity and sensitivity (c.f., Bombick and Allison, 1989;Shimadzu Corporation, 2004). Impurities in the carrier and makeup gases further contribute to the detector background level.…”

Section: Overview Of the Ftdmentioning

confidence: 99%

“…Pyrolysis of nitrogen atom (N)-containing functionalities in the fuel is the primary mechanism proposed for HCN release from biomass combustion (Johnson and Kang, 1971;Glarborg et al, 2003). Hydrogen cyanide has been measured from field biomass fires (Hurst et al, 1994a, b;Goode et al, 2000;Yokelson et al, 2007;Crounse et al, 2009), and from laboratory biomass combustion systems (Lobert et al, 1991;Holzinger et al, 1999;Christian et al, 2004;Becidan et al, 2007). Elevated free tropospheric HCN columns were measured from the International Scientific Station of the Jungfraujoch (ISSJ) in the Swiss Alps by solar infrared (IR) spectroscopy during 1998, coinciding with a period of intense BB in the tropics (Rinsland et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A gas chromatographic instrument for measurement of hydrogen cyanide in the lower atmosphere

et al. 2012

View full text Add to dashboard Cite

Abstract. A gas-chromatographic (GC) instrument was developed for measuring hydrogen cyanide (HCN) in the lower atmosphere. The main features of the instrument are (1) a cryogen-free cooler for sample dehumidification and enrichment, (2) a porous polymer PLOT column for analyte separation, (3) a flame thermionic detector (FTD) for sensitive and selective detection, and (4) a dynamic dilution system for calibration. We deployed the instrument for a ∼4 month period from January-June, 2010 at the AIRMAP atmospheric monitoring station Thompson Farm 2 (THF2) in rural Durham, NH. A subset of measurements made during 3-31 March is presented here with a detailed description of the instrument features and performance characteristics. The temporal resolution of the measurements was ∼20 min, with a 75 s sample capture time. The 1σ measurement precision was <10 % and the instrument response linearity was excellent on a calibration scale of 0.10-0.75 ppbv (±5 %). The estimated method detection limit (MDL) and accuracy were 0.021 ppbv and 15 %, respectively. From 3-31 March 2010, ambient HCN mixing ratios ranged from 0.15-1.0 ppbv (±15 %), with a mean value of 0.36 ± 0.16 ppbv (1σ ). The approximate mean background HCN mixing ratio of 0.20 ± 0.04 ppbv appeared to agree well with tropospheric column measurements reported previously. The GC-FTD HCN measurements were strongly correlated with acetonitrile (CH 3 CN) measured concurrently with a proton transfer-reaction mass spectrometer (PTR-MS), as anticipated given our understanding that the nitriles share a common primary biomass burning source to the global atmosphere. The nitriles were overall only weakly correlated with carbon monoxide (CO), which is reasonable considering the greater diversity of sources for CO. However, strong correlations with CO were observed on several nights under stable atmospheric conditions and suggest regional combustion-based sources for the nitriles. These results demonstrate that the GC-FTD instrument is capable of making long term, in-situ measurements of HCN in the lower atmosphere. To date, similar measurements have not been performed, yet they are critically needed to (1) better evaluate the regional scale distribution of HCN in the atmosphere and (2) discern the influence of biomass burning on surface air composition in remote regions.

show abstract

Section: Overview Of the Ftdmentioning

confidence: 99%

Section: Overview Of the Ftdmentioning

confidence: 99%

Section: Overview Of the Ftdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A gas chromatographic instrument for measurement of hydrogen cyanide in the lower atmosphere

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Several models have been proposed to account for the selectivity of the TID response to nitrogen-and phosphoruscontaining compounds [84,86,99,100,[103][104][105][106]. They differ principally in whether the interaction between the alkali metal atoms and organic fragments occurs as a homogeneous reaction in the gas phase or is purely a surface phenomena.…”

Section: Thermionic Ionization Detectormentioning

confidence: 99%

Instrumental Aspects of Gas Chromatography

Poole

1991

Chromatography Today

View full text Add to dashboard Cite

Flame-based thermionic detection coupled on-line with microcolumn liquid chromatography

Kientz¹,

Verweij²,

Jong³

et al. 1992

Journal of Chromatography A

View full text Add to dashboard Cite

Investigations Into the Response Mechanism of the Gas Chromatographic Thermionic Ionization Detector Part I. Mass Spectral Studies

Cited by 14 publications

References 0 publications

A gas chromatographic instrument for measurement of hydrogen cyanide in the lower atmosphere

A gas chromatographic instrument for measurement of hydrogen cyanide in the lower atmosphere

Instrumental Aspects of Gas Chromatography

Flame-based thermionic detection coupled on-line with microcolumn liquid chromatography

Contact Info

Product

Resources

About