Photoionization Detector Sensitivity of Organic Compounds

Langhorst, Marsha L.

doi:10.1093/chromsci/19.2.98

Cited by 55 publications

(22 citation statements)

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“…It can be seen that the PID has a higher response to dichloroethene, a compound containing 2 chlorine atoms, and a lower response to trans 1-chloro-l,2-difluoroethene that contains two atoms of fluorine and one of chlorine. These results are in agreement with observations concerning halogenated compounds in the literature: fluoro atoms lower the response, while chlorine atoms enhance it [7]. For all other substances the sensitivity is comparable.…”

Section: Figuresupporting

confidence: 92%

GC determination of halogenated olefins by photoionization and hall electrolytic conductivity detectors in series in matrices of hydrofluorocarbons and hydrochlorofluorocarbons

1997

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SummaryGas chromatography (GC) with photoionization (PI) and Hall electrolytic conductivity (E1C) detectors connected in series, has been used for the determination of chlorofluorinated oleflns. The separation of different standard solutions containing eight chlorofluorinated ethenes in nitrogen and in halogenated matrices has been performed in wide bore capillaries, 0.53 mm i.d,. and normal capillaries, 0.32 mm i.d.. The quality of separation is obviously influenced by their limited load capacity and by the response time of the Hall detector. At concentrations 1-150 jaL L -1 halogenated olefins, both PI and E1C detectors have linear response and can detect minimum levels of 0.2-0.5 ng and 0.4-1.2 ng, respectively. The PID is particularly selective toward halogenated olefins and is extremely useful for the determination of traces of unsaturated halogenated hydrocarbons in a matrix of saturated homologues. The results of this work are of great interest for the detection of chlorofluorinated oleflns, highly toxic compounds usually formed as by-products in the industrial production of hydrofluorocarbons and hydrochlorofluorocarbons.

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Section: Figuresupporting

confidence: 92%

GC determination of halogenated olefins by photoionization and hall electrolytic conductivity detectors in series in matrices of hydrofluorocarbons and hydrochlorofluorocarbons

1997

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“…These compounds are mainly aromatic molecules with ring activators (xylene, ethylbenzene, benzaldehyde, methylethylbenzene, trimethylbenzene), unsaturated compounds with electron release groups (acetone, isoprene) or cyclic compounds (cyclopentene, methylcyclopentene). Their VUV photon ionization cross‐sections are large so they are more easily ionized by photons 46. The peak assignment was carried out by referring to the literature on the composition of cigarette smoke studied by Zimmermann and co‐workers 15, 42.…”

Section: Resultsmentioning

confidence: 99%

A new membrane inlet interface of a vacuum ultraviolet lamp ionization miniature mass spectrometer for on‐line rapid measurement of volatile organic compounds in air

Hou¹,

Wang²,

Li³

2007

Rapid Comm Mass Spectrometry

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A novel membrane inlet interface coupled to a single-photon ionization (SPI) miniature time-of-flight mass spectrometer has been developed for on-line rapid measurement of volatile organic compounds (VOCs). The vacuum ultraviolet (VUV) light source for SPI was a commercial krypton discharge lamp with photon energy of 10.6 eV and photon flux of 10(10) photons/s. The experimental results showed that the sensitivity was 5 times as high as obtained with the traditional membrane inlet. The enrichment efficiency could be adjusted in the range of 10 to 20 times for different VOCs when a buffer cell was added to the inlet interface, and the memory effect was effectively eliminated. A detection limit as low as 25 parts-per-billion by volume (ppbv) for benzene has been achieved, with a linear dynamic range of three orders of magnitude. The rise times were 6 s, 10 s and 15 s for benzene, toluene and p-xylene, respectively, and the fall time was only 6 s for all of these compounds. The analytical capacity of this system was demonstrated by the on-line analysis of VOCs in single puff mainstream cigarette smoke, in which more than 50 compounds were detected in 2 s.

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“…With the 10.2 eV photon source most molecules are ionized; the exceptions are the permanent gases, c i~c4 hydrocarbons, methanol, acetonitrile and chloromethanes. The most comprehensive collection of response data for more than a hundred compounds, relative to benzene, has been compiled by Langhorst [114]. The PID is 5 to 10 times more sensitive than the FID for alkanes and about 50 times so for aromatic compounds [107,108], Freedman has shown that the ionization potential of the molecule is the most important single factor determining the PID response, the relative number of xelectrons having little significance [112].…”

Section: Photoionization Detectormentioning

confidence: 99%

“…It has beenshown that careful thermostating of the detector is required to reduce baseline drift[107,109].The processes occurring within the detector can be represented by a series of equations (3.2-3.7)[110][111][112][113][114][115][116][117][118][119][120][121][122][123]. (Reproduced with permission from HNU Systems).…”

mentioning

confidence: 99%

Instrumental Aspects of Gas Chromatography

Poole

1991

Chromatography Today

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Photoionization Detector Sensitivity of Organic Compounds

Cited by 55 publications

References 0 publications

GC determination of halogenated olefins by photoionization and hall electrolytic conductivity detectors in series in matrices of hydrofluorocarbons and hydrochlorofluorocarbons

GC determination of halogenated olefins by photoionization and hall electrolytic conductivity detectors in series in matrices of hydrofluorocarbons and hydrochlorofluorocarbons

A new membrane inlet interface of a vacuum ultraviolet lamp ionization miniature mass spectrometer for on‐line rapid measurement of volatile organic compounds in air

Instrumental Aspects of Gas Chromatography

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