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Riter, Leah S.; Takáts, Zoltán; Cooks, R. Graham

doi:10.1039/b105857f

Cited by 41 publications

(42 citation statements)

References 21 publications

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“…Experiments were performed using a modified ThermoFinnigan (San Jose, CA, USA) ITS‐40 ion trap mass spectrometer, described elsewhere 15. The MIMS system, shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

High surface area membrane introduction mass spectrometry for analysis of volatile and semi‐volatile organic compounds in air

Riter

Takáts

Charles

et al. 2001

Rapid Comm Mass Spectrometry

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The construction, optimization, and testing of a novel geometry for a semi-permeable polydimethylsiloxane membrane introduction mass spectrometry (MIMS) system is described. A long poly(dimethylsiloxane) capillary membrane (0.30 mm i.d., 0.64 mm o.d., 60 cm long) was positioned coaxially inside polytetrafluoroethylene tubing (0.80 mm i.d. and 1.60 mm o.d.), allowing for a large surface area membrane of relatively small thickness. Helium, flowing counter-current on the vacuum side of the membrane, swept the permeate into the mass spectrometer. This optimized geometry for permeation MIMS air analysis allows on-line detection of volatile and semi-volatile organic compounds of environmental interest, with limits of detection in the ppt range and a linear response over 3 to 4 orders of magnitude. The system is characterized by short rise and fall times, 10 and 48 s, respectively, for toluene.

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“…Experiments were performed using a modified ThermoFinnigan (San Jose, CA, USA) ITS‐40 ion trap mass spectrometer, described elsewhere 15. The MIMS system, shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

High surface area membrane introduction mass spectrometry for analysis of volatile and semi‐volatile organic compounds in air

Riter

Takáts

Charles

et al. 2001

Rapid Comm Mass Spectrometry

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“…Permeated analyte is usually ionized with electron ionization (EI) or chemical ionization (CI), and the parent and fragment ions are then mass analyzed and detected. MIMS has proven to be valuable for the direct online analysis of volatile organic compounds (VOCs) in aqueous [4][5][6][7] and air [4,[8][9][10] samples by demonstrating promising simplicity, speed, and trace-level detection. MIMS has also been used in biological applications [11][12][13] and online environmental monitoring of industrial processes [14].…”

Section: Introductionmentioning

confidence: 99%

Improving the selectivity of non-polar alkanes, alkenes, and aromatic hydrocarbon compounds by the application of acetonitrile as a Cl reagent

Alwedian

Abu‐Shandi

2009

Open Chemistry

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Abstract:The selective enhancement of membrane introduction mass spectrometry for non-polar alkanes, alkenes, and aromatic hydrocarbon compounds by the application of acetonitrile as a chemical ionization reagent was investigated. Acetonitrile CI is able to produce specific fragment ions for many of the compounds test and this can be used to identify and quantify the parent neutrals. This method provided relatively high detection limits of the test compounds. This method could potentially be useful for analytical applications such as the detection of non-polar hydrocarbons for environmental studies if CH 3 CN CI/MIMS is coupled with a preconcentration method.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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“…However, the pressure of 10 À3 Pa inside the SPI source limited the sample input, and the limit of detection (LOD) of benzene was only 25 mg L À1 . Other types of membrane inlet have also been developed to improve the performance of on-line mass spectrometry, [13][14][15][16][17][18][19][20][21][22][23][24] such as the direct external probe hollow ber membrane (HFM), 25 the direct ow-through HFM probe, 13,26 the trap-and-release HFM, 15,21 the intermediate pressure region membrane and the single-side membrane etc.…”

Section: Introductionmentioning

confidence: 99%

An in-source stretched membrane inlet for on-line analysis of VOCs in water with single photon ionization TOFMS

Hou

Chen

et al. 2013

Analyst

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An in-source, stretched, hollow fiber membrane (HFM) inlet has been developed to improve the sensitivity of on-line time-of-flight mass spectrometry (TOFMS) with a vacuum ultraviolet (VUV) lamp based single photon ionization (SPI) source for the direct analysis of liquid samples. A 2-cm HFM was stretched to 8 cm in length, and placed in the ion source and directly under the VUV lamp window with a distance of 15 mm. Compared with the conventional flow-through configuration under the same experimental conditions, the signal intensities of selected volatile organic compounds (VOCs) of methyl tert-butyl ether (MTBE), ethyl tert-butyl ether (ETBE), benzene, toluene and p-xylene were increased over 5-fold in magnitude, and the response time was shortened to one-third. The limits of detection (LOD) of MTBE, ETBE, benzene, toluene and p-xylene ranged from 0.25 to 1.3 mg L À1 with a measurement time of 60 s, and three orders of linear range were obtained with correlation coefficients of 0.9972-0.9992. The present results suggest that the in-source stretched HFM is a simple and effective way to increase the sensitivity and shorten response time of the membrane inlet, and we believe that it will also be beneficial to other types of on-line mass spectrometer for the on-line analysis of VOCs in water with a VUV lamp based SPI ion source.

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Untitled

Cited by 41 publications

References 21 publications

High surface area membrane introduction mass spectrometry for analysis of volatile and semi‐volatile organic compounds in air

High surface area membrane introduction mass spectrometry for analysis of volatile and semi‐volatile organic compounds in air

Improving the selectivity of non-polar alkanes, alkenes, and aromatic hydrocarbon compounds by the application of acetonitrile as a Cl reagent

An in-source stretched membrane inlet for on-line analysis of VOCs in water with single photon ionization TOFMS

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