Quantification of gas phase methyl iodide using H3O+ as the reagent ion in the PTR-MS technique.
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| Title: | Quantification of gas phase methyl iodide using H3O+ as the reagent ion in the PTR-MS technique. |
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| Authors: | Mekić, Majda1, Temime-Roussel, Brice1, Monod, Anne1, Strekowski, Rafal S.1 rafal.strekowski@univ-amu.fr |
| Source: | International Journal of Mass Spectrometry. Jan2018, Vol. 424, p10-15. 6p. |
| Subjects: | Methyl iodide, Proton transfer reactions, Oxonium ions, Nuclear energy, Collisions (Nuclear physics) |
| Abstract: | In this work, the proton transfer reaction between the hydronium ion (H 3 O + ) and methyl iodide (CH 3 I) is studied to investigate if consistent quantification of the gas phase CH 3 I is possible in humid air. The neutral CH 3 I molecule was chosen because this compound is of environmental importance in the field of nuclear power plant safety and nuclear energy. Water was used as a reagent ion source in a conventional Insbruck PTR-MS to produce H 3 O + reagent ions. The use of H 3 O + ions allows for fast, sensitive and specific detection of gas phase CH 3 I via a proton-transfer reaction H 3 O + + CH 3 I → [CH 3 I-H] + + H 2 O. The instrument response was linear in the tested 5–96 ppbV range and the PTR-MS sensitivity was observed to be humidity dependent. The observed sensitivity was in found to range between 1.6 and 3.3 cps/ppb at relative humidity between 63 and 15% at T = 23 °C. A typical H 3 O + primary ion signal was 10 7 cps and the normalized sensitivity was in the range between 0.16 and 0.33 ncps/ppb. The instrument CH 3 IH + ion background rate was 6.8 ± 1.4 cps and the dwell time was 1 s. The detection limit was calculated as 3 times the standard deviation of the background level and ranged between 1.3 and 3.8 ppb. The theoretical collision rate based on the dipole moment and molecular polarizability is calculated. The theoretical collision rate is compared with the experimentally obtained values. The results indicate that the PTR-MS technique is a good analytical method to detect and quantify gas phase CH 3 I concentrations. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Mass Spectrometry is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 126994603 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Quantification of gas phase methyl iodide using H3O+ as the reagent ion in the PTR-MS technique. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mekić%2C+Majda%22">Mekić, Majda</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Temime-Roussel%2C+Brice%22">Temime-Roussel, Brice</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Monod%2C+Anne%22">Monod, Anne</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Strekowski%2C+Rafal+S%2E%22">Strekowski, Rafal S.</searchLink><relatesTo>1</relatesTo><i> rafal.strekowski@univ-amu.fr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Mass+Spectrometry%22">International Journal of Mass Spectrometry</searchLink>. Jan2018, Vol. 424, p10-15. 6p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Methyl+iodide%22">Methyl iodide</searchLink><br /><searchLink fieldCode="DE" term="%22Proton+transfer+reactions%22">Proton transfer reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Oxonium+ions%22">Oxonium ions</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+energy%22">Nuclear energy</searchLink><br /><searchLink fieldCode="DE" term="%22Collisions+%28Nuclear+physics%29%22">Collisions (Nuclear physics)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In this work, the proton transfer reaction between the hydronium ion (H 3 O + ) and methyl iodide (CH 3 I) is studied to investigate if consistent quantification of the gas phase CH 3 I is possible in humid air. The neutral CH 3 I molecule was chosen because this compound is of environmental importance in the field of nuclear power plant safety and nuclear energy. Water was used as a reagent ion source in a conventional Insbruck PTR-MS to produce H 3 O + reagent ions. The use of H 3 O + ions allows for fast, sensitive and specific detection of gas phase CH 3 I via a proton-transfer reaction H 3 O + + CH 3 I → [CH 3 I-H] + + H 2 O. The instrument response was linear in the tested 5–96 ppbV range and the PTR-MS sensitivity was observed to be humidity dependent. The observed sensitivity was in found to range between 1.6 and 3.3 cps/ppb at relative humidity between 63 and 15% at T = 23 °C. A typical H 3 O + primary ion signal was 10 7 cps and the normalized sensitivity was in the range between 0.16 and 0.33 ncps/ppb. The instrument CH 3 IH + ion background rate was 6.8 ± 1.4 cps and the dwell time was 1 s. The detection limit was calculated as 3 times the standard deviation of the background level and ranged between 1.3 and 3.8 ppb. The theoretical collision rate based on the dipole moment and molecular polarizability is calculated. The theoretical collision rate is compared with the experimentally obtained values. The results indicate that the PTR-MS technique is a good analytical method to detect and quantify gas phase CH 3 I concentrations. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Mass Spectrometry is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.ijms.2017.11.004 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 10 Subjects: – SubjectFull: Methyl iodide Type: general – SubjectFull: Proton transfer reactions Type: general – SubjectFull: Oxonium ions Type: general – SubjectFull: Nuclear energy Type: general – SubjectFull: Collisions (Nuclear physics) Type: general Titles: – TitleFull: Quantification of gas phase methyl iodide using H3O+ as the reagent ion in the PTR-MS technique. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mekić, Majda – PersonEntity: Name: NameFull: Temime-Roussel, Brice – PersonEntity: Name: NameFull: Monod, Anne – PersonEntity: Name: NameFull: Strekowski, Rafal S. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 13873806 Numbering: – Type: volume Value: 424 Titles: – TitleFull: International Journal of Mass Spectrometry Type: main |
| ResultId | 1 |
