Tsis ntev los no, pab pawg tshawb fawb ntawm Xin Zhang los ntawm Lub Tsev Haujlwm Saib Xyuas Dej hiav txwv, Suav Academy ntawm Kev Tshawb Fawb (IOCS) tau ua tiav tshiab hauv kev txheeb xyuas thiab ntsuas cov methane carbon isotopes raws li nyob rau hauv situ laser Raman spectroscopy, siv qhov sib txawv tseem ceeb hauv Raman spectra. ntawm methane carbon isotopes (13CH4 thiab 12CH4), thiab cov txiaj ntsig cuam tshuam tau raug luam tawm tsis ntev los no nyob rau hauv thoob ntiaj teb spectroscopy phau ntawv xov xwm Spectrochimica Acta Part A: Molecular thiab Biomolecular Spectroscopy.
Dej hiav txwv hydrothermal systems tso tawm ntau ntawm CH4, H2 thiab lwm yam kev txo cov pa roj carbon monoxide uas pub cov chemosynthetic biomes, uas yog ib qho tseem ceeb rau kev kawm txog keeb kwm ntawm lub neej thaum ntxov. Txawm li cas los xij, lub hauv paus ntawm cov methane concentration siab yog tseem muaj teeb meem, piv txwv li, methane concentration nyob rau hauv super-MgFe hydrothermal system ntawm Zaj sawv yog siab li 2.5 mmol / kg, uas yog ntau dua li methane tawm los ntawm cov dej-pob zeb cov tshuaj tiv thaiv. Nyob rau hauv lub laboratory.Carbon isotope muaj pes tsawg leeg ntawm CH4 yog ib tug haib txhais tau tias sib txawv ntawm biogenic thiab abiogenic methane, tab sis cov kev sim uas twb muaj lawm thiab carbon isotope tus nqi xeem txoj kev yuav siv tsis tau kom tshem tawm cov methane tawm los ntawm lub laboratory. Txawm li cas los xij, cov txheej txheem kev sim uas twb muaj lawm thiab cov qauv ntsuas cov pa roj carbon isotope tsis tuaj yeem tshem tawm cov kev cuam tshuam ntawm cov pa roj carbon monoxide tom qab, uas cuam tshuam rau kev sim kev ntseeg siab. Nyob rau hauv xyoo tas los no, txoj kev loj hlob sai ntawm nyob rau hauv situ Raman spectroscopy tau ua rau nws muaj peev xwm txiav txim siab roj isotopes nyob rau hauv situ, tab sis tseem tsis muaj Raman spectroscopic kev tshawb fawb ntawm methane carbon isotopes nyob rau hauv high-temperature thiab high-pressure hydrothermal systems.
Txhawm rau daws cov teeb meem saum toj no, pab pawg tshawb fawb tau tshawb xyuas Raman spectral yam ntxwv ntawm 13CH4 thiab 12CH4 hauv cov ntshiab CH4 system thiab CH4-H2O system ntawm qhov kub thiab txias siab (25-400oC, {{8} }} bar) los ntawm kev siv lub capillary high-pressure pob tshab kab noj hniav. Nws tau pom tias lub ncov ntawm cov yam ntxwv ncov ntawm 13CH4 nyob rau hauv thaj tsam ntawm 2907cm-1-2912cm-1, txav mus rau qis nthwv dej nrog qhov nce ntawm qhov kub thiab txias, thaum lub ncov ntawm cov Cov yam ntxwv ncov ntawm 12CH4 nyob rau hauv thaj tsam ntawm 2912cm-1 -2917 cm-1, uas ib txwm siab dua 13CH4 los ntawm 4.6-5.1 cm-1 nyob rau hauv tib qhov kub thiab txias , qhia tau hais tias ob qho no tuaj yeem paub qhov txawv ntawm Raman spectroscopy (Daim duab 1). Tsis tas li ntawd, pawg neeg tshawb fawb kuj tau tsim Raman quantitative calibration qauv rau cov concentrations ntawm 13CH4 thiab 12CH4 nyob rau hauv aqueous daws (Daim duab 2), uas qhia tau hais tias qhov sib txawv ntawm Raman quantitative calibration qauv rau yaj 13CH4 thiab 12CH4 yog vim qhov sib txawv ntawm cov Raman tawg hla ntu ntawm cov yaj 13CH4 thiab 12CH4 lawv tus kheej, tsis yog cov kev hloov pauv ntawm cov molar ntom ntawm cov dej los yog Raman tawg hla ntu ntawm cov yaj 13CH4 thiab 12CH4. Cov txiaj ntsig kev tshawb fawb muaj feem xyuam muab kev txhawb zog rau kev txheeb xyuas hauv qhov chaw thiab kev txheeb xyuas ntau ntawm cov pa roj carbon isotope muaj pes tsawg leeg ntawm methane, uas muaj kev siv dav dav hauv qhov kub thiab txias siab hydrothermal thwmsim thiab dej hiav txwv tob hauv qhov chaw tshawb nrhiav.
Thawj tus kws sau ntawv yog Yuzhou Ge, tus kws kho mob ntawm lub koom haum ntawm Oceanography, Suav Academy ntawm Kev Tshawb Fawb, thiab Xin Zhang, tus kws tshawb fawb, yog tus sau tsab xov xwm. Cov kev tshawb fawb no tau koom tes los ntawm National Natural Science Foundation ntawm Tuam Tshoj thiab Chav Kawm A Strategic Pilot Program ntawm Suav Academy ntawm Sciences.
Cov txiaj ntsig thiab kev sib txuas muaj xws li hauv qab no:
Ge, Y., Li, L., Xi, S., Zhang, Y., Luan, Z., thiab Zhang, X., 2023, Kev sib piv ntawm Raman spectral yam ntxwv thiab ntau txoj kev ntawm 13CH4 thiab 12CH4 los ntawm 25 txog 400 degree thiab 50 mus rau 400 bar: Spectrochimica Acta Part A: Molecular thiab Biomolecular Spectroscopy, p. 12 3380.
Daim duab 1 Peak txoj haujlwm thiab ib nrab-qhov siab thiab qhov dav dav ntawm cov yam ntxwv peaks ntawm 13CH4 thiab 12CH4 ntawm qhov sib txawv ntawm qhov kub thiab txias.
Daim duab 2 Raman quantitative calibration qauv ntawm 13CH4 thiab 12CH4 raws li OH dabtsi yog khoov vibrational bands (a) thiab stretching vibrational bands (b) dej
