Volatile Organic Compound Analysis by an Inertial Spray Extraction Interface Coupled to an Ion Trap Mass Spectrometer

St-Germain, François; Mamer, Orval; Brunet, Julie.; Vachon, Benoit.; Tardif, Robert; Abribat, Thierry.; Rosiers, Christine Des; Montgomery, J. A.

doi:10.1021/ac00120a017

Cited by 17 publications

(6 citation statements)

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“…In most cases, the effect would be negligibly small, but in some cases, especially for nanodevices operating under ambient conditions, this could be pivotal in running them under optimal conditions. [1][2][3][4][5][6][7][8] Unfortunately, no device is yet available to measure the effect directly, but we reported recently that the VOC effect, at least on nanostructured gold and silver, can be identified, although indirectly, by means of surface-enhanced Raman scattering (SERS) of isocyanides. [9][10][11] For instance, in the presence of acetone the NC stretching band of 2,6-dimethylphenylisocyanide (2,6-DMPI) on Au blue-shifted by as much as 6 cm À1 , while the same band red-shifted by as much as 20 cm À1 in the presence of ammonia.…”

Section: Introductionmentioning

confidence: 99%

Effect of volatile organic chemicals on surface-enhanced Raman scattering of 4-aminobenzenethiol on Ag: comparison with the potential dependence

Kim

Choi

et al. 2011

Phys. Chem. Chem. Phys.

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4-Aminobenzenethiol (4-ABT) is an unusual molecule in the sense that several distinct peaks whose counterparts are rarely found in the normal Raman spectrum are observed in its surface-enhanced Raman scattering (SERS) spectra. Their origin has been argued over recently as due to either a metal-to-adsorbate charge transfer or the formation of a photoreaction product such as dimercaptoazobenzene (DMAB). In an electrochemical SERS measurement, the intensities of the new peaks depended strongly not only on the excitation wavelength but also on the electrode potential. Interestingly, we observed a similar spectral variation even under ambient conditions by exposure of 4-ABT on Ag to volatile organic chemicals (VOCs) such as acetone and ammonia. Since acetone and ammonia barely react directly with 4-ABT, the effect of VOCs must be indirect, presumably associated with the movement of electrons between VOCs and the Ag substrate causing either an increase or a decrease in the surface potential of Ag. Based on the potential-dependent SERS data, the effect of acetone therefore appeared to correspond to an application of +0.15 V to the Ag substrate vs. a saturated Ag/AgCl electrode, while the effect of ammonia corresponded to the application of -0.45 V to Ag. We admit that much the same VOC effect could be observable if a photoproduct was formed immediately upon irradiation and the product was also subjected to a chemical enhancement mechanism. The Gaussian response of the peak intensities of the b(2)-type bands to applied potential, as well as to VOCs, dictated that the new peaks appearing in the SERS of 4-ABT have nothing to do with any electrochemical reaction. In addition, a separate preliminary work suggested that the b(2)-type bands are not at least due to a photoreaction product such as DMAB.

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Section: Introductionmentioning

confidence: 99%

Effect of volatile organic chemicals on surface-enhanced Raman scattering of 4-aminobenzenethiol on Ag: comparison with the potential dependence

Kim

Choi

et al. 2011

Phys. Chem. Chem. Phys.

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“…It directs a portion of the aqueous stream through an atomizer and into a small enclosed chamber through which a stream of helium is passed. The VOCs are partitioned from the aerosol droplets into the helium and transported into the MS. [94][95][96][97] Both the membrane probe and aerosol stripping probe produce steady-state signals that are proportional to analyte concentration. However, because of the time lag associated with the permeation of organics through a membrane, it responds more slowly to changes in analyte concentration than the aerosol stripping probe.…”

Section: Vocs In Water and Soil Slurriesmentioning

confidence: 99%

Review of direct MS analysis of environmental samples

Wise

Thompson

Merriweather

et al. 1997

Field Analyt. Chem. Technol.

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“…This paper discusses a new way of decreasing the sample preparation time. We use a rapid method in which samples can be successively extracted and separated, with injection of a new sample every 45 s. The basis for our extraction is a system reported by St. Germain et al, in which a small spray chamber was used for introducing aqueous volatile organic compound (VOC) samples to an ion trap mass spectrometer . In their study, transient pulses lasting only 4 s were achieved from extraction of VOCs (into a vacuum) from 1-mL blood samples in the ppm range.…”

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confidence: 99%

Rapid-Extraction High-Speed GC Analysis of Volatile Organic Compounds in Aqueous Samples

and

Borgerding

1999

Anal. Chem.

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An extraction system to remove volatile organic compounds (VOCs) from an aqueous matrix in a time frame that is compatible with high-speed gas chromatography (HSGC) has been developed and interfaced to a cryofocusing instrument. Using this system, VOCs are quantitatively extracted in ∼20 s, with no residual signal present during subsequent analysis. This allows successive injections, as demonstrated by sequential extraction and separation of four aqueous samples in less than 31/2 min. Analysis time was minimized by designing the system to allow concurrent extraction and separation. The entire sample extract is introduced to the cryofocusing injector of the HSGC, resulting in excellent sensitivity. Injection of only 100 μL of an aqueous mixture of VOCs in the low parts per billion range resulted in chromatographic peaks with signal-to-noise ratios ranging from 6.5 to 41 depending on analyte. Reproducibility of sequential analyses at this concentration resulted in less than 5% relative standard deviation.

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Volatile Organic Compound Analysis by an Inertial Spray Extraction Interface Coupled to an Ion Trap Mass Spectrometer

Cited by 17 publications

References 0 publications

Effect of volatile organic chemicals on surface-enhanced Raman scattering of 4-aminobenzenethiol on Ag: comparison with the potential dependence

Effect of volatile organic chemicals on surface-enhanced Raman scattering of 4-aminobenzenethiol on Ag: comparison with the potential dependence

Review of direct MS analysis of environmental samples

Rapid-Extraction High-Speed GC Analysis of Volatile Organic Compounds in Aqueous Samples

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