Relevant bibliographies by topics / Chemical ionization reaction mass spectrometry (CIR-MS)

Academic literature on the topic 'Chemical ionization reaction mass spectrometry (CIR-MS)'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Chemical ionization reaction mass spectrometry (CIR-MS)"

1

Wyche, K. P., R. S. Blake, A. M. Ellis, P. S. Monks, T. Brauers, R. Koppmann, and E. Apel. "Performance of Chemical Ionization Reaction Time-of-Flight Mass Spectrometry (CIR-TOF-MS) for the measurement of atmospherically significant oxygenated volatile organic compounds." Atmospheric Chemistry and Physics Discussions 6, no. 5 (October 12, 2006): 10247–74. http://dx.doi.org/10.5194/acpd-6-10247-2006.

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Abstract. The performance of a new chemical ionization reaction time-of-flight mass spectrometer (CIR-TOF-MS) utilising the environment chamber SAPHIR (Simulation of Atmospheric Photochemistry In a large Reaction Chamber – Forschungzentrum Jülich, Germany) is described. The work took place as part of the ACCENT (Atmospheric Composition and Change the European NeTwork for excellence) supported oxygenated volatile organic compound (OVOC) measurement intercomparison during January 2005. The experiment entailed the measurement of 14 different atmospherically significant OVOCs at various mixing ratios in the approximate range 10.0–0.6 ppbV. The CIR-TOF-MS operated throughout the exercise with the hydronium ion (H3O+) as the primary chemical ionization (CI) reagent in order to facilitate proton transfer to the analyte OVOCs. The results show the CIR time-of-flight mass spectrometer is capable of detecting a wide range of atmospheric OVOCs down to sub-ppbV mixing ratios with high accuracy and precision. It is demonstrated that the technique has rapid multi-channel response at the required sensitivity, accuracy and precision for atmospheric OVOC measurements.
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Wyche, K. P., R. S. Blake, A. M. Ellis, P. S. Monks, T. Brauers, R. Koppmann, and E. C. Apel. "Technical Note: Performance of Chemical Ionization Reaction Time-of-Flight Mass Spectrometry (CIR-TOF-MS) for the measurement of atmospherically significant oxygenated volatile organic compounds." Atmospheric Chemistry and Physics 7, no. 3 (February 8, 2007): 609–20. http://dx.doi.org/10.5194/acp-7-609-2007.

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Abstract. The performance of a new chemical ionization reaction time-of-flight mass spectrometer (CIR-TOF-MS) utilising the environment chamber SAPHIR (Simulation of Atmospheric Photochemistry In a large Reaction Chamber- Forschungzentrum Jülich, Germany) is described. The work took place as part of the ACCENT (Atmospheric Composition and Change the European NeTwork for excellence) supported oxygenated volatile organic compound (OVOC) measurement intercomparison during January 2005. The experiment entailed the measurement of 14 different atmospherically significant OVOCs at various mixing ratios in the approximate range 10.0–0.6 ppbV. The CIR-TOF-MS operated throughout the exercise with the hydronium ion (H3O+) as the primary chemical ionization (CI) reagent in order to facilitate proton transfer to the analyte OVOCs. The results presented show that the CIR time-of-flight mass spectrometer is capable of detecting a wide range of atmospheric OVOCs at mixing ratios of around 10 ppbV in "real-time" (i.e. detection on the one-minute time scale), with sub-ppbV measurement also achieved following an increase in averaging time to tens of minutes. It is shown that in general OVOC measurement is made with high accuracy and precision, with integration time, mixing ratio and compound dependent values as good as 4–13% and 3–15% respectively. It is demonstrated that CIR-TOF-MS has rapid multi-channel response at the required sensitivity, accuracy and precision for atmospheric OVOC measurement.
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Zaytsev, Alexander, Martin Breitenlechner, Abigail R. Koss, Christopher Y. Lim, James C. Rowe, Jesse H. Kroll, and Frank N. Keutsch. "Using collision-induced dissociation to constrain sensitivity of ammonia chemical ionization mass spectrometry (NH<sub>4</sub><sup>+</sup> CIMS) to oxygenated volatile organic compounds." Atmospheric Measurement Techniques 12, no. 3 (March 20, 2019): 1861–70. http://dx.doi.org/10.5194/amt-12-1861-2019.

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Abstract. Chemical ionization mass spectrometry (CIMS) instruments routinely detect hundreds of oxidized organic compounds in the atmosphere. A major limitation of these instruments is the uncertainty in their sensitivity to many of the detected ions. We describe the development of a new high-resolution time-of-flight chemical ionization mass spectrometer that operates in one of two ionization modes: using either ammonium ion ligand-switching reactions such as for NH4+ CIMS or proton transfer reactions such as for proton-transfer-reaction mass spectrometer (PTR-MS). Switching between the modes can be done within 2 min. The NH4+ CIMS mode of the new instrument has sensitivities of up to 67 000 dcps ppbv−1 (duty-cycle-corrected ion counts per second per part per billion by volume) and detection limits between 1 and 60 pptv at 2σ for a 1 s integration time for numerous oxygenated volatile organic compounds. We present a mass spectrometric voltage scanning procedure based on collision-induced dissociation that allows us to determine the stability of ammonium-organic ions detected by the NH4+ CIMS instrument. Using this procedure, we can effectively constrain the sensitivity of the ammonia chemical ionization mass spectrometer to a wide range of detected oxidized volatile organic compounds for which no calibration standards exist. We demonstrate the application of this procedure by quantifying the composition of secondary organic aerosols in a series of laboratory experiments.
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Sobreira, Tiago Jose P., Larisa Avramova, Botond Szilagyi, David L. Logsdon, Bradley P. Loren, Zinia Jaman, Ryan T. Hilger, et al. "High-throughput screening of organic reactions in microdroplets using desorption electrospray ionization mass spectrometry (DESI-MS): hardware and software implementation." Analytical Methods 12, no. 28 (2020): 3654–69. http://dx.doi.org/10.1039/d0ay00072h.

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Implementation of a novel method for high-throughput screening of reactions in microdroplets. The reaction and analysis steps are performed simultaneously using desorption electrospray ionization mass spectrometry (DESI-MS) at a rate of up to 1 reaction mixture per second.
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Wu, Hui-Fen, and Ya-Ping Lin. "Study of Ion—Molecule Reactions and Collisionally-Activated Dissociation of Dopamine and Adrenaline by an Ion Trap Mass Spectrometer with An External Ionization Source." European Journal of Mass Spectrometry 6, no. 1 (February 2000): 65–77. http://dx.doi.org/10.1255/ejms.331.

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Study of the reaction mechanisms for ion–molecule reactions and for collisionally-activated dissociations (CAD) of dopamine and adrenaline has been performed using an external chemical ionization source quadrupole ion trap mass spectrometer. This work demonstrates the possibility of applying an external source ion trap instrument to perform selective ion–molecule reactions in the gas phase, due to its high sensitivity and low detection limits in mass spectrometry/mass spectrometry (MS/MS) mode. CAD experiments on ions with relative intensity as low as 0–2%, formed as ion–molecule products of dopamine and adrenaline, have been successfully performed. Study of some fragment ions of M+• and [M + H]+, observed in the chemical ionization (CI) spectra, by CAD techniques, permits elucidation of a series of mechanisms for the sequential dissociations of the M+• and [M + H]+ ions. Thus, the structural information obtained from this method is similar to that which would have been obtained if MS n had been performed for M+• and [M + H]+ ions. From the proposed CAD reaction mechanisms and the semi-empirical calculations, the favored reactive sites for formation of the adduct ions could be determined. The reactive site for protonation of dopamine is on the amino group, but for adrenaline, it is on the benzylic hydroxyl group. As to the reactive site for the CH3O=C2H+ ion addition, dopamine is either on the amino group or on the phenyl ring. However, adrenaline is only on the benzylic hydroxyl group. Temperature effects on the formation of the ion–molecule products were also investigated. It was shown that the best source temperature for formation of [M + H]+ and [M + 13]+ ions of dopamine is 200°C. Information about use of dimethyl ether (DME) as the reagent gas in the external chemical ionization of an ion trap mass spectrometer is provided.
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Rovelli, Grazia, Michael I. Jacobs, Megan D. Willis, Rebecca J. Rapf, Alexander M. Prophet, and Kevin R. Wilson. "A critical analysis of electrospray techniques for the determination of accelerated rates and mechanisms of chemical reactions in droplets." Chemical Science 11, no. 48 (2020): 13026–43. http://dx.doi.org/10.1039/d0sc04611f.

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The application of Electrospray and Electrosonic Spray Ionization Mass Spectrometry (ESI-MS and ESSI-MS) to study accelerated reaction kinetics in droplets is examined using numerical models, new experimental data, and prior literature.
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Lento, Cristina, Gerald F. Audette, and Derek J. Wilson. "Time-resolved electrospray mass spectrometry — a brief history." Canadian Journal of Chemistry 93, no. 1 (January 2015): 7–12. http://dx.doi.org/10.1139/cjc-2014-0260.

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This review describes the evolution of time-resolved electrospray ionization mass spectrometry (TRESI-MS), a technology that was developed in large part at Western University. TRESI-MS was initially designed to characterize rapid chemical and biochemical reactions occurring on the millisecond time scale without need for a chromophore. Early TRESI-MS setups usually consisted of continuous-flow rapid mixers with a fixed tee for analysis of a single time point, and later adjustable reaction chamber devices allowing for automatic tracking of the reaction over time. Advances in instrumentation design over the years have resulted in improved time resolution, with microfluidic device implementation allowing for coupling to hydrogen−deuterium exchange (HDX) experiments. Areas of application that will be discussed include the investigation of protein folding intermediates, identification of enzyme−substrate intermediates in the pre-steady state, and the use of time-resolved HDX to study the dynamics of weakly structured protein regions. While some limitations still persist with the method, the continued development of TRESI-MS and related approaches paves the way to a promising future and the study of unexplored application areas.
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Ferreira, Christina R., Karen E. Yannell, Alan K. Jarmusch, Valentina Pirro, Zheng Ouyang, and R. Graham Cooks. "Ambient Ionization Mass Spectrometry for Point-of-Care Diagnostics and Other Clinical Measurements." Clinical Chemistry 62, no. 1 (January 1, 2016): 99–110. http://dx.doi.org/10.1373/clinchem.2014.237164.

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Abstract BACKGROUND One driving motivation in the development of point-of-care (POC) diagnostics is to conveniently and immediately provide information upon which healthcare decisions can be based, while the patient is on site. Ambient ionization mass spectrometry (MS) allows direct chemical analysis of unmodified and complex biological samples. This suite of ionization techniques was introduced a decade ago and now includes a number of techniques, all seeking to minimize or eliminate sample preparation. Such approaches provide new opportunities for POC diagnostics and rapid measurements of exogenous and endogenous molecules (e.g., drugs, proteins, hormones) in small volumes of biological samples, especially when coupled with miniature mass spectrometers. CONTENT Ambient MS-based techniques are applied in diverse fields such as forensics, pharmaceutical development, reaction monitoring, and food analysis. Clinical applications of ambient MS are at an early stage but show promise for POC diagnostics. This review provides a brief overview of various ambient ionization techniques providing background, examples of applications, and the current state of translation to clinical practice. The primary focus is on paper spray (PS) ionization, which allows quantification of analytes in complex biofluids. Current developments in the miniaturization of mass spectrometers are discussed. SUMMARY Ambient ionization MS is an emerging technology in analytical and clinical chemistry. With appropriate MS instrumentation and user-friendly interfaces for automated analysis, ambient ionization techniques can provide quantitative POC measurements. Most significantly, the implementation of PS could improve the quality and lower the cost of POC testing in a variety of clinical settings.
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Piel, Felix, Markus Müller, Klaus Winkler, Jenny Skytte af Sätra, and Armin Wisthaler. "Introducing the extended volatility range proton-transfer-reaction mass spectrometer (EVR PTR-MS)." Atmospheric Measurement Techniques 14, no. 2 (February 22, 2021): 1355–63. http://dx.doi.org/10.5194/amt-14-1355-2021.

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Abstract. Proton-transfer-reaction mass spectrometry (PTR-MS) is widely used in atmospheric sciences for measuring volatile organic compounds in real time. In the most widely used type of PTR-MS instruments, air is directly introduced into a chemical ionization reactor via an inlet capillary system. The reactor has a volumetric exchange time of ∼0.1 s, enabling PTR-MS analyzers to measure at a frequency of 10 Hz. The time response does, however, deteriorate if low-volatility analytes interact with surfaces in the inlet or in the instrument. Herein, we present the extended volatility range (EVR) PTR-MS instrument which mitigates this issue. In the EVR configuration, inlet capillaries are made of passivated stainless steel, and all wetted metal parts in the chemical ionization reactor are surface-passivated with a functionalized hydrogenated amorphous silicon coating. Heating the entire setup (up to 120 ∘C) further improves the time-response performance. We carried out time-response performance tests on a set of 29 analytes having saturation mass concentrations C0 in the range between 10−3 and 105 µg m−3. The 1/e-signal decay times after instant removal of the analyte from the sampling flow were between 0.2 and 90 s for gaseous analytes. We also tested the EVR PTR-MS instrument in combination with the chemical analysis of aerosols online (CHARON) particle inlet, and 1/e-signal decay times were in the range between 5 and 35 s for particulate analytes. We show on a set of example compounds that the time-response performance of the EVR PTR-MS instrument is comparable to that of the fastest flow tube chemical ionization mass spectrometers that are currently in use. The fast time response can be used for rapid (∼1 min equilibration time) switching between gas and particle measurements. The CHARON EVR PTR-MS instrument can thus be used for real-time monitoring of both gaseous and particulate organics in the atmosphere. Finally, we show that the CHARON EVR PTR-MS instrument also rapidly detects highly oxygenated species (with up to eight oxygen atoms) in particles formed by limonene ozonolysis.
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Rissanen, Matti P., Jyri Mikkilä, Siddharth Iyer, and Jani Hakala. "Multi-scheme chemical ionization inlet (MION) for fast switching of reagent ion chemistry in atmospheric pressure chemical ionization mass spectrometry (CIMS) applications." Atmospheric Measurement Techniques 12, no. 12 (December 17, 2019): 6635–46. http://dx.doi.org/10.5194/amt-12-6635-2019.

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Abstract. A novel chemical ionization inlet named the Multi-scheme chemical IONization inlet (MION), Karsa Ltd., Helsinki, Finland) capable of fast switching between multiple reagent ion schemes is presented, and its performance is demonstrated by measuring several known oxidation products from much-studied cyclohexene and α-pinene ozonolysis systems by applying consecutive bromide (Br−) and nitrate (NO3-) chemical ionization. Experiments were performed in flow tube reactors under atmospheric pressure and room temperature (22 ∘C) utilizing an atmospheric pressure interface time-of-flight mass spectrometer (APi-ToF-MS, Tofwerk Ltd., Thun, Switzerland) as the detector. The application of complementary ion modes in probing the same steady-state reaction mixture enabled a far more complete picture of the detailed autoxidation process; the HO2 radical and the least-oxidized reaction products were retrieved with Br− ionization, whereas the highest-oxidized reaction products were detected in the NO3- mode, directly providing information on the first steps and on the ultimate endpoint of oxidation, respectively. While chemical ionization inlets with multiple reagent ion capabilities have been reported previously, an application in which the charging of the sample occurs at atmospheric pressure with practically no sample pretreatment, and with the potential to switch the reagent ion scheme within a second timescale, has not been introduced previously. Also, the ability of bromide ionization to detect highly oxygenated organic molecules (HOM) from atmospheric autoxidation reactions has not been demonstrated prior to this investigation.
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Books on the topic "Chemical ionization reaction mass spectrometry (CIR-MS)"

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Reactive intermediates: MS investigations in solution. Weinheim: Wiley-VCH, 2010.

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Enke, Christie G., and Leonardo S. Santos. Reactive Intermediates: MS Investigations in Solution. Wiley & Sons, Incorporated, John, 2009.

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Enke, Christie G., and Leonardo S. Santos. Reactive Intermediates: MS Investigations in Solution. Wiley & Sons, Limited, John, 2010.

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Book chapters on the topic "Chemical ionization reaction mass spectrometry (CIR-MS)"

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Wyche, Kevin P., Christopher Whyte, Robert S. Blake, Rebecca L. Cordell, Kerry A. Willis, Andrew M. Ellis, and Paul S. Monks. "Atmospheric Monitoring With Chemical Ionisation Reaction Time-of-Flight Mass Spectrometry (CIR-TOF-MS) and Future Developments: Hadamard Transform Mass Spectrometry." In Advanced Environmental Monitoring, 64–76. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6364-0_5.

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Conference papers on the topic "Chemical ionization reaction mass spectrometry (CIR-MS)"

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Dagaut, P., A. Mze´-Ahmed, K. Hadj-Ali, and P. Die´vart. "Synthetic Jet Fuel Combustion: Experimental and Kinetic Modeling Study." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45234.

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Fischer-Tropsch liquid fuels synthesized from syngas, also called synthetic paraffinic jet fuel (SPK), can be used to replace conventional petroleum-derived fuels in jet engines. Whereas currently syngas is mostly produced from coal of natural gas, its production from biomass has been reported. These synthetic liquid fuels contain a very high fraction of iso-alkanes, while conventional jet fuels contain large fractions of n-alkanes, cycloalkanes (naphtenes), and aromatics. In that contest, a jet-stirred reactor (JSR) was used to study the kinetics of oxidation of a 100% SPK and a 50/50 SPK/Jet A-1mixture over a broad range of experimental conditions (10 atm, 560 to 1030K, equivalence ratios of 0.5 to 2, 1000 ppm of fuel). The temperature was varied step-wise, keeping the mean residence time in the JSR constant and equal to 1s. Three combustion regimes were observed over this temperature range: the cool-flame oxidation regime (560–740K), the negative temperature coefficient (NTC) regime (660–740K), and the high-temperature oxidation regime (>740K). More than 15 species were identified and measured by Fourier transform infrared spectrometry (FTIR), gas chromatography/mass spectrometry (CG/MS), flame ionization detection (FID), and thermal conductivity detection (TCD). The results consisting of concentration profiles of reactants, stable intermediates and products as a function of temperature showed similar kinetics of oxidation for the fuels considered, although the 100% SPK was more reactive. A surrogate detailed chemical kinetic reaction mechanism was used to model these experiments and ignition experiments taken from the literature. The kinetic modeling showed reasonable agreement between the data and the computations whereas model improvements could be achieved using more appropriate surrogate model fuels. Kinetic computations involving reaction paths analyses and sensitivity analyses were used to interpret the results.
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Polaert, Isabelle, Lilivet Ubiera, Lokmane Abdelouahed, and Bechara Taouk. "MICROWAVE PYROLYSIS OF BIOMASS IN A ROTATORY KILN REACTOR: DEEP CHARACTERIZATION AND COMPARATIVE ANALYSIS OF PYROLYTIC LIQUIDS PRODUCTS." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9807.

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The pursuit of sustainable relationship between the production and consumption of energy has accelerated the research into new fuels alternatives, and mainly focused on new technologies for biomass based fuels. Microwave pyrolysis of biomass is a relatively new process which has been long recognized to provide better quality bio-products in shorter reaction time due to the direct sample heating and the particular heating profile resulting from the interaction of biomass with the electric field component of an electromagnetic wave [1,2]. During the course of this research, flax shives were pyrolysed using a rotatory kiln reactor inside a microwave single mode cavity using a range of power between 100 and 200 watts, to reach a temperature range between 450 °C and 650°C. The liquid bio-oil samples recovered in each case were analyzed though gas chromatography-mass spectrometry (GC-MS) and gas chromatography-flame ionization detection (GC-FID) to identify and quantify the different molecules presents and paying a particular attention to the BTX’s concentration. More than two hundred compounds were identified and grouped into families such as carboxylic acids, alcools, sugars for a deep analysis of the results. The effect of the operating conditions on the proportion of gas, liquid and char produced were studied as well as some properties of the pyrolysis products. In most cases, carboxylic acids were the dominating chemical group present. It was also noticed that the increase of temperature enhanced the carboxylic acids production and diminished the production of other groups, as sugars. Finally, pyrolysis oils were produced in higher quantities by microwaves than in a classical oven and showed a different composition. The examination of the pyrolytic liquid products from different biomass components helped to determine the provenance of each molecule family. On the operational side, the rotatory kiln reactor provided a fast and homogeneous heating profile inside the reactor, desired for fast pyrolysis. The high temperature was maintained without making hot spots during the reaction time. The microwave irradiation setup consisted in a single-mode cavity, a system of plungers, incident and reflected power monitors, an isolator and a 2.45 GHz continuous microwave generator with a power upper limit of 2000 watts. The plunger system was calibrated to maintain a range of reflective wave between 5 and 15%, taking advantage of a minimum of 85 percent of the applied power. In conclusion, the developed microwave pyrolysis process gives a clear way to produce an exploitable bio-oil with enhanced properties. References Beneroso, D., Monti, T., Kostas, E., Robinson, J., CEJ, 2017.,316, 481- 498. Autunes E., Jacob M., Brodie, G., Schneider, A., JAAP, 2018,129, 93-100.
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