Methanethiol
- Formula: CH4S
- Molecular weight: 48.107
- IUPAC Standard InChIKey: LSDPWZHWYPCBBB-UHFFFAOYSA-N
- CAS Registry Number: 74-93-1
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Methyl mercaptan; Mercaptomethane; CH3SH; Methyl sulfhydrate; Methyl thioalcohol; Mercaptan methylique; Methaanthiol; Methanthiol; Methvtiolo; Methylmercaptaan; Metilmercaptano; Rcra waste number U153; Thiomethanol; UN 1064; Methanethiole
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Gas phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -5.46 ± 0.14 | kcal/mol | Ccr | Good, Lacina, et al., 1961 |
Reaction thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
By formula: F- + CH4S = (F- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 34.2 ± 2.0 | kcal/mol | IMRE | Larson and McMahon, 1983 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 23.2 | cal/mol*K | N/A | Larson and McMahon, 1983 | gas phase; switching reaction(F-)H2O, Entropy change calculated or estimated; Arshadi, Yamdagni, et al., 1970; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 27.3 ± 2.0 | kcal/mol | IMRE | Larson and McMahon, 1983 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M |
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 357.6 ± 2.0 | kcal/mol | D-EA | Schwartz, Davico, et al., 2000 | gas phase; B |
ΔrH° | 357.5 ± 2.0 | kcal/mol | D-EA | Moran and Ellison, 1988 | gas phase; B |
ΔrH° | 356.9 ± 2.2 | kcal/mol | G+TS | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 350.6 ± 2.0 | kcal/mol | IMRE | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale; B |
CH3S- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 395.3 ± 2.6 | kcal/mol | G+TS | Kass, Guo, et al., 1990 | gas phase; Acidity between D2O and Me2NH.; B |
ΔrH° | 391.6 ± 7.7 | kcal/mol | D-EA | Kass, Guo, et al., 1990 | gas phase; Between O2 and SO2. Explains bad anchor in McIver Jr. and Fukuda, 1982; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 388.2 ± 2.5 | kcal/mol | IMRB | Kass, Guo, et al., 1990 | gas phase; Acidity between D2O and Me2NH.; B |
By formula: (CH6N+ • 2C2H3N) + CH4S = (CH6N+ • CH4S • 2C2H3N)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 7.8 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 20. | cal/mol*K | N/A | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
2.4 | 270. | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
By formula: Cl- + CH4S = (Cl- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.5 ± 3.0 | kcal/mol | IMRB | Staneke, Groothuis, et al., 1995 | gas phase; Chloride affinity comparable to that of CHCl3; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 10.8 ± 3.0 | kcal/mol | IMRB | Staneke, Groothuis, et al., 1995 | gas phase; Chloride affinity comparable to that of CHCl3; B |
By formula: C2H3O2- + CH4S = (C2H3O2- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 14.9 ± 1.0 | kcal/mol | TDAs | Meot-ner, 1988 | gas phase; B,M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.8 | cal/mol*K | PHPMS | Meot-ner, 1988 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 8.1 ± 1.0 | kcal/mol | TDAs | Meot-ner, 1988 | gas phase; B |
By formula: (CH6N+ • C2H3N) + CH4S = (CH6N+ • CH4S • C2H3N)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 9.9 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 20.0 | cal/mol*K | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
By formula: CH6N+ + CH4S = (CH6N+ • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.4 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.1 | cal/mol*K | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
By formula: HI + CH3IS = CH4S + I2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -2.88 ± 0.54 | kcal/mol | Eqk | Shum and Benson, 1983 | gas phase; ALS |
Mass spectrum (electron ionization)
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
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Additional Data
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Due to licensing restrictions, this spectrum cannot be downloaded.
Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
NIST MS number | 86 |
UV/Visible spectrum
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Spectrum
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Additional Data
View image of digitized spectrum (can be printed in landscape orientation).
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Download spectrum in JCAMP-DX format.
Source | Bol'shakov, et al., 1969 |
---|---|
Owner | INEP CP RAS, NIST OSRD Collection (C) 2007 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
Origin | INSTITUTE OF ENERGY PROBLEMS OF CHEMICAL PHYSICS, RAS |
Source reference | RAS UV No. 20091 |
Instrument | unknown |
Boiling point | 5.9 |
Gas Chromatography
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Mass spectrum (electron ionization), UV/Visible spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Packed | SE-30 | 42. | 400. | Rudenko, Mal'tsev, et al., 1985 | Column length: 3. m |
Packed | Squalane | 60. | 401. | Zygmunt and Staszewski, 1981 | Chromosorb W DMCS; Column length: 2. m |
Packed | Squalane | 80. | 401. | Zygmunt and Staszewski, 1981 | Chromosorb W DMCS; Column length: 2. m |
Packed | Squalane | 27. | 393. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 49. | 396. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 67. | 398. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 86. | 401. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Van Den Dool and Kratz RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | HP-5MS | 464. | Bonaiti, Irlinger, et al., 2005 | 30. m/0.25 mm/0.25 μm, He; Program: 5C(8min) => 3C/min => 20C => 10C/min => 150C(10min) |
Capillary | HP-5 | 464. | Engel, Baty, et al., 2002 | 30. m/0.25 mm/0.25 μm, He; Program: 5C(5min) => 3C/min => 20C => 5C/min => 100C 15C/min => 150C (5min) |
Van Den Dool and Kratz RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-Wax | 643. | Wu and Cadwallader, 2002 | 30. m/0.53 mm/1. μm, He, 40. C @ 5. min, 10. K/min, 200. C @ 30. min |
Van Den Dool and Kratz RI, polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Supelcowax-10 | 694. | Majcher and Jelen, 2007 | 30. m/0.25 mm/0.25 μm; Program: 40C(2min) => 40C/min => 60C(2min) => 5C/min => 240C |
Capillary | Supelcowax-10 | 695. | Majcher and Jelén, 2005 | 30. m/0.25 mm/0.25 μm, He; Program: 40C(2min) => 40C/min => 60(2min)C => 5C/min => 240C |
Normal alkane RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-5 | 473. | Cais-Sokolinska, Majcher, et al., 2011 | 25. m/0.20 mm/0.33 μm, Helium, 50. C @ 1. min, 20. K/min; Tend: 240. C |
Capillary | OV-101 | 414. | Zenkevich, 2005 | 25. m/0.20 mm/0.10 μm, N2/He, 6. K/min; Tstart: 50. C; Tend: 250. C |
Capillary | PONA | 414. | Yang, Wang, et al., 2004 | 50. m/0.20 mm/0.50 μm, N2, 2. K/min; Tstart: 35. C; Tend: 170. C |
Capillary | PONA | 460. | Yang, Wang, et al., 2003 | 50. m/0.20 mm/0.50 μm, 2. K/min; Tstart: 30. C; Tend: 150. C |
Capillary | DB-1 | 430. | Hansen, Buttery, et al., 1992 | 30. C @ 25. min, 4. K/min, 200. C @ 20. min; Column length: 60. m; Column diameter: 0.32 mm |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-1 | 444. | Chantreau, Rochat, et al., 2006 | 20. m/0.18 mm/0.18 μm; Program: not specified |
Capillary | PONA | 461. | Yang, Wang, et al., 2003 | 50. m/0.20 mm/0.50 μm; Program: not specified |
Capillary | Polydimethyl siloxanes | 414. | Zenkevich, 1998 | Program: not specified |
Capillary | Polydimethyl siloxanes | 414. | Zenkevich and Chupalov, 1996 | Program: not specified |
Capillary | SPB-1 | 414. | Nedjma and Maujean, 1995 | 30. m/0.32 mm/4. μm, H2; Program: 35(1)-10 -> 55-25 ->250 |
Capillary | DB-1 | 460. | Kawai, Ishida, et al., 1991 | 60. m/0.25 mm/0.25 μm; Program: not specified |
Normal alkane RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | ZB-Wax | 688. | Marin, Pozrl, et al., 2008 | 60. m/0.32 mm/0.50 μm, Helium, 40. C @ 5. min, 4. K/min, 220. C @ 5. min |
Capillary | HP-Innowax | 640. | Senger-Emonnot, Rochard, et al., 2006 | 60. m/0.32 mm/0.5 μm, He, 2. K/min, 220. C @ 10. min; Tstart: 60. C |
Capillary | DB-Wax | 675. | Spadone, Matthey-Doret, et al., 2006 | 60. m/0.25 mm/0.25 μm, Helium, 35. C @ 3. min, 6. K/min, 240. C @ 10. min |
Capillary | TC-Wax | 702. | Ishizaki, Tachihara, et al., 2005 | 60. m/0.25 mm/0.25 μm, N2, 3. K/min, 220. C @ 40. min; Tstart: 70. C |
Capillary | TC-Wax | 700. | Ishikawa, Ito, et al., 2004 | 60. m/0.25 mm/0.5 μm, He, 40. C @ 8. min, 3. K/min; Tend: 230. C |
Capillary | DB-Wax | 690. | Kumazawa and Masuda, 2003 | 60. m/0.25 mm/0.25 μm, He, 3. K/min; Tstart: 40. C; Tend: 210. C |
Capillary | DB-Wax | 696. | Kumazawa and Masuda, 2003 | 30. m/0.25 mm/0.25 μm, He, 3. K/min; Tstart: 40. C; Tend: 210. C |
Capillary | DB-Wax | 655. | Cadwallader and Heo, 2001 | 30. m/0.53 mm/1. μm, He, 40. C @ 5. min, 6. K/min, 225. C @ 30. min |
Capillary | Supelcowax-10 | 668. | Girard and Durance, 2000 | 60. m/0.25 mm/0.25 μm, He, 35. C @ 10. min, 4. K/min; Tend: 200. C |
Capillary | DB-Wax | 679. | Schlüter, Steinhart, et al., 1999 | 60. m/0.32 mm/0.25 μm, He, 34. C @ 3. min, 5. K/min, 200. C @ 10. min |
Capillary | DB-Wax | 699. | Umano, Hagi, et al., 1995 | He, 40. C @ 2. min, 2. K/min; Column length: 60. m; Column diameter: 0.25 mm; Tend: 200. C |
Normal alkane RI, polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | TC-Wax | 702. | Kraft and Switt, 2005 | Program: not specified |
Capillary | TC-Wax | 702. | Tachihara, Ishizaki, et al., 2004 | Program: not specified |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Mass spectrum (electron ionization), UV/Visible spectrum, Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Good, Lacina, et al., 1961
Good, W.D.; Lacina, J.L.; McCullough, J.P.,
Methanethiol and carbon disulfide: Heats of combustion and formation by rotating-bomb calorimetry,
J. Phys. Chem., 1961, 65, 2229-2231. [all data]
Larson and McMahon, 1983
Larson, J.W.; McMahon, T.B.,
Strong hydrogen bonding in gas-phase anions. An ion cyclotron resonance determination of fluoride binding energetics to bronsted acids from gas-phase fluoride exchange equilibria measurements,
J. Am. Chem. Soc., 1983, 105, 2944. [all data]
Wenthold and Squires, 1995
Wenthold, P.G.; Squires, R.R.,
Bond dissociation energies of F2(-) and HF2(-). A gas-phase experimental and G2 theoretical study,
J. Phys. Chem., 1995, 99, 7, 2002, https://doi.org/10.1021/j100007a034
. [all data]
Arshadi, Yamdagni, et al., 1970
Arshadi, M.; Yamdagni, R.; Kebarle, P.,
Hydration of Halide Negative Ions in the Gas Phase. II. Comparison of Hydration Energies for the Alkali Positive and Halide Negative Ions,
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. [all data]
Schwartz, Davico, et al., 2000
Schwartz, R.L.; Davico, G.E.; Lineberger, W.C.,
Negative-ion photoelectron spectroscopy of CH3S-,
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. [all data]
Moran and Ellison, 1988
Moran, S.; Ellison, G.B.,
Photoelectron Spectroscopy of Sulfur Ions,
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. [all data]
Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr.,
The gas phase acidity scale from methanol to phenol,
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Kass, Guo, et al., 1990
Kass, S.R.; Guo, H.-Z.; Dahlke, G.D.,
The Thiomethyl Anion: Formation, Reactivity, and Thermodynamic Properties,
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. [all data]
McIver Jr. and Fukuda, 1982
McIver Jr.; Fukuda, E.K.,
Equilibrium Electron Affinities,
Lec. Notes in Chem., 1982, 31, 165. [all data]
Meot-Ner (Mautner) and Sieck, 1985
Meot-Ner (Mautner), M.; Sieck, L.W.,
The Ionic Hydrogen Bond and Ion Solvation. 4. SH+ O and NH+ S Bonds. Correlations with Proton Affinity. Mutual Effects of Weak and Strong Ligands in Mixed Clusters,
J. Phys. Chem., 1985, 89, 24, 5222, https://doi.org/10.1021/j100270a021
. [all data]
Staneke, Groothuis, et al., 1995
Staneke, P.O.; Groothuis, G.; Ingemann, S.; Nibbering, N.M.M.,
Formation, stability and structure of radical anions of chloroform, tetrachloromethane and fluorotrichloromethane in the gas phase,
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. [all data]
Meot-ner, 1988
Meot-ner, M.,
Ionic Hydrogen Bond and Ion Solvation. 6. Interaction Energies of the Acetate Ion with Organic Molecules. Comparison of CH3COO- with Cl-, CN-, and SH-,
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. [all data]
Shum and Benson, 1983
Shum, L.G.S.; Benson, S.W.,
Thermochemnistry and kinetics of the reaction of methyl mercaptan with iodine,
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Bol'shakov, G.F., et al.,
Ultraviolet spectra of heteroorganic compounds, 1969, 83. [all data]
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Gas chromatographic analysis of volatile substances evolved into atmosphere from polymer materials,
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Zygmunt and Staszewski, 1981
Zygmunt, B.; Staszewski, R.,
Retention index and gas chromatographic-mass spectrometric identification of thiols in liquified gas,
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Hively and Hinton, 1968
Hively, R.A.; Hinton, R.E.,
Variation of the retention index with temperature on squalane substrates,
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. [all data]
Bonaiti, Irlinger, et al., 2005
Bonaiti, C.; Irlinger, F.; Spinnler, H.E.; Engel, E.,
An iterative sensory procedure to select odor-active associations in complex consortia of microorganisms: application to the construction of a cheese model,
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. [all data]
Engel, Baty, et al., 2002
Engel, E.; Baty, C.; le Corre, D.; Souchon, I.; Martin, N.,
Flavor-active compounds potentially implicated in cooked cauliflower acceptance,
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. [all data]
Wu and Cadwallader, 2002
Wu, Y.-F.G.; Cadwallader, K.R.,
Characterization of the aroma of a meatlike process flavoring from soybean-based enzyme-hydrolyzed vegetable protein,
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. [all data]
Majcher and Jelen, 2007
Majcher, M.A.; Jelen, H.H.,
Effect of Cysteine and Cystine Addition on Sensory Profile and Potent Odorants of Extruded Potato Snacks,
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. [all data]
Majcher and Jelén, 2005
Majcher, M.A.; Jelén, H.H.,
Identification of potent odorants formed during the preparation of extruded potato snacks,
J. Agric. Food Chem., 2005, 53, 16, 6432-6437, https://doi.org/10.1021/jf050412x
. [all data]
Cais-Sokolinska, Majcher, et al., 2011
Cais-Sokolinska, D.; Majcher, M.; Pikul, J.; Bielinska, S.; Czauderma, M.; Wojtowski, J.,
The effect of Camelia sativa cake diet supplementation on sensory and volatile profiles of ewe's milk,
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Zenkevich, I.G.,
Experimentally measured retention indices., 2005. [all data]
Yang, Wang, et al., 2004
Yang, Y.; Wang, Z.; Zong, B.; Yang, H.,
Determination of sulfur compounds in fluid catalytic cracking gasoline by gas chromatography with a sulfur chemiluminiscence detector,
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Yang, Wang, et al., 2003
Yang, Y.-T.; Wang, Z.; Han. J.-H.; Tian, H.-P.; Yang, H.-Y.,
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Chantreau, A.; Rochat, S.; de Saint Laumer, J.-Y.,
Re-investigation of sulfur impact odorants in roast beef using comprehensive two-dimensional GC-TOF-MS and the GC-SNIF,
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Zenkevich, I.G.,
The Principle of Structural Analogy in the Calculation of Gas Chromatographic Retention Indices using Physico-Chemical Constants of Organic Compounds,
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Zenkevich and Chupalov, 1996
Zenkevich, I.G.; Chupalov, A.A.,
New Possibilities of Chromato Mass Pectrometric Identification of Organic Compounds Using Increments of Gas Chromatographic Retention Indices of Molecular Structural Fragments,
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Nedjma and Maujean, 1995
Nedjma, M.; Maujean, A.,
Improved chromatographic analysis of volatile sulfur compounds by the static headspace technique on water-alcohol solutions and brandies with chemiluminescence detection,
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. [all data]
Kawai, Ishida, et al., 1991
Kawai, T.; Ishida, Y.; Kakiuchi, H.; Ikeda, N.; Higashida, T.; Nakamura, S.,
Flavor components of dried squid,
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Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Mass spectrum (electron ionization), UV/Visible spectrum, Gas Chromatography, References
- Symbols used in this document:
T Temperature ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔrS° Entropy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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