Investigating Hydrogen Isotope Variation during Heating of n-Alkanes under Limited Oxygen Conditions: Implications for Palaeoclimate Reconstruction in Archaeological Settings
Abstract
:1. Introduction
2. Results
2.1. Concentration and Molecular Distribution of n-Alkanes
2.2. Variation in δ2Hwax of Thermally Unaltered Reference Samples and Heated Samples of Celtis Australis
3. Discussion
4. Materials and Methods
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Samples Availability
References
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Celtis Leaves | |||||
---|---|---|---|---|---|
Ref | 150 °C | 250 °C | 350 °C | 450 °C | |
Total n-alkane (µg/g) | 459 | 484 | 360 | 97.0 | 28.8 |
CPI25-33 | 2.7 | 3.3 | 5.6 | 4.3 | 1.1 |
ACL25-33 | 30.3 | 30.4 | 30.5 | 30.1 | 29.7 |
Celtis Branch Interior (Xylem) | |||||
Ref | 150 °C | 250 °C | 350 °C | 450 °C | |
Total n-alkane (µg/g) | 0.9 | 0.9 | 1.2 | 1.6 | 0.1 |
CPI25-33 | 1.3 | 1.3 | 1.3 | 1.5 | - |
ACL25-33 | 26.9 | 26.9 | 27.1 | 26.0 | 25.0 |
Celtis Branch Exterior (Bark) | |||||
Ref | 150 °C | 250 °C | 350 °C | 450 °C | |
Total n-alkane (µg/g) | 18.5 | 4.2 | 3.5 | 8.5 | 0.1 |
CPI25-33 | 3.1 | 3.4 | 1.6 | 1.1 | - |
ACL25-33 | 26.5 | 26.9 | 27.9 | 26.6 | - |
Celtis Leaves | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Ref | σ | 150 °C | σ | 250 °C | σ | 350 °C | σ | 450 °C | σ | |
C27 | −106.7 | 1.2 | −94.3 | 4.3 | −122.1 | 3.2 | −120.5 | 2.9 | −73.3 | 2.1 |
C29 | −130.7 | 1.0 | −132.0 | 1.4 | −133.9 | 3.7 | −134.8 | 0.6 | −99.5 | 1.0 |
C31 | −128.2 | 0.6 | −131.3 | 0.9 | −132.8 | 3.0 | −135.0 | 1.7 | −87.0 | 6.1 * |
Celtis Branch Interior (Xylem) | ||||||||||
Ref | σ | 150 °C | σ | 250 °C | σ | 350 °C | σ | 450 °C | σ | |
C27 | - | - | −146.8 | 1.8 | −165.4 | 2.7 | - | - | - | - |
C29 | - | - | −188.2 | 3.5 | −222.7 | 1.3 | - | - | - | - |
C31 | −193.4 | 1.1 | −273.7 | 2.4 | −241.2 | 2.2 | - | - | - | - |
Celtis Branch Exterior (Bark) | ||||||||||
Ref | σ | 150 °C | σ | 250 °C | σ | 350 °C | σ | 450 °C | σ | |
C27 | −167.3 | 0.8 | −190.8 | 2.3 | −224.3 | 3.0 | −204.5 | 0.8 | - | - |
C29 | −158.5 | 4.0 | −167.7 | 1.5 | −237.8 | 5.2 * | −207.5 | 4.1 | - | - |
C31 | −151.4 | 1.3 | −141.2 | 4.2 | −235.2 | 3.3 | −224.5 | 0.9 | - | - |
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Connolly, R.; Jambrina-Enríquez, M.; Herrera-Herrera, A.V.; Mallol, C. Investigating Hydrogen Isotope Variation during Heating of n-Alkanes under Limited Oxygen Conditions: Implications for Palaeoclimate Reconstruction in Archaeological Settings. Molecules 2021, 26, 1830. https://doi.org/10.3390/molecules26071830
Connolly R, Jambrina-Enríquez M, Herrera-Herrera AV, Mallol C. Investigating Hydrogen Isotope Variation during Heating of n-Alkanes under Limited Oxygen Conditions: Implications for Palaeoclimate Reconstruction in Archaeological Settings. Molecules. 2021; 26(7):1830. https://doi.org/10.3390/molecules26071830
Chicago/Turabian StyleConnolly, Rory, Margarita Jambrina-Enríquez, Antonio V. Herrera-Herrera, and Carolina Mallol. 2021. "Investigating Hydrogen Isotope Variation during Heating of n-Alkanes under Limited Oxygen Conditions: Implications for Palaeoclimate Reconstruction in Archaeological Settings" Molecules 26, no. 7: 1830. https://doi.org/10.3390/molecules26071830