Results 31 to 40 of about 288,749 (288)

Measurements of position-specific carbon isotopic compositions in propane by on-line Gas Chromatography-Pyrolysis-Gas Chromatography-Isotope Ratio Mass Spectrometer (GC-Py-GC-IRMS) and its preliminary application

Shiyou shiyan dizhi, 2022
In this study, an on-line Gas Chromatography-Pyrolysis-Gas Chromatography-Isotope Ratio Mass Spectrometer (GC-Py-GC-IRMS) was established to conduct position-specific isotope analysis (PSIA) by enrichment of compound interested, chromatographic ...
Yuanyuan MA, Cheng TAO, Liqiang BA, Jie WANG, Jipeng LI, Luyun LI, Yongge SUN   +6 more
doaj   +1 more source

Progress and challenges in using stable isotopes to trace plant carbon and water relations across scales [PDF]

Biogeosciences, 2012
Stable isotope analysis is a powerful tool for assessing plant carbon and water relations and their impact on biogeochemical processes at different scales.
C. Werner, H. Schnyder, M. Cuntz, C. Keitel, M. J. Zeeman, T. E. Dawson, F.-W. Badeck, E. Brugnoli, J. Ghashghaie, T. E. E. Grams, Z. E. Kayler, M. Lakatos, X. Lee, C. Máguas, J. Ogée, K. G. Rascher, R. T. W. Siegwolf, S. Unger, J. Welker, L. Wingate, A. Gessler   +20 more
doaj   +1 more source

Inversion Characteristics of Hydrocarbon Gases Carbon Isotopes Varying With Temperature and Implications for Shale Exploration

Frontiers in Earth Science, 2021
In order to understand the influence of source rock types and maturity on hydrocarbon gases carbon isotope change more objectively, a closed-system pyrolysis experiment was carried out on six samples from 250 to 550°C.
Yingqin Wu, Yanhong Liu, Tong Wang, Zhiyu Wang, Zhiyu Wang, Longmiao Yuan, Longmiao Yuan, Yanqin Xia   +7 more
doaj   +1 more source

The dissolution of olivine added to soil at 32°C: the fate of weathering products and its implications for enhanced weathering at different temperatures

Frontiers in Climate
The amendment of agricultural soils by crushed silicate minerals has been proposed to enhance weathering rates and facilitate carbon dioxide (CO2) removal from the atmosphere. Laboratory dissolution experiments typically provide weathering rates that are
Nicholas Iff, Phil Renforth, Philip A. E. Pogge von Strandmann   +2 more
doaj   +1 more source

Mechanisms of carbon isotopic fractionation in the process of natural gas generation: Geochemical evidence from thermal simulation experiment

Petroleum Exploration and Development, 2020
Low maturity coal samples were taken from the Ordos Basin to conduct gold tube thermal simulation experiment in a closed system, and the characteristics of the products were analyzed to find out the fractionation mechanism of carbon isotopes and the ...
Weilong PENG, Quanyou LIU, Guoyi HU, Yue LYU, Dongya ZHU, Qingqiang MENG, Fengtao GUO, Ruoli WANG   +7 more
doaj   +1 more source

INTERREGIONAL CORRELATION OF THE MIDDLE FRASNIAN (UPPER DEVONOIAN) OF THE NORTH-WEST OF THE RUSSIAN PLATE AND THE EAST OF THE PECHORA PLATE: AN ECOGEOCHEMICAL ASPECT

Геодинамика и тектонофизика, 2022
The paper provides an example of the first stratigraphic application of ecogeochemical method based on the analysis of the carbon isotope values in conodont elements.
A. V. Zhuravlev
doaj   +1 more source

Calculation of isotope shifts and relativistic shifts in CI, CII, CIII and CIV

, 2005
We present an accurate ab initio method of calculating isotope shifts and relativistic shifts in atomic spectra. We test the method on neutral carbon and three carbon ions.
I. I. Sobel’man, I. Lindgren, J. C. Berengut, J. R. Holmes, M. G. Kozlov, M. G. Kozlov, R. Quast, V. V. Flambaum   +7 more
core   +1 more source

Geochemical characteristics of coal-measure source rocks and coal-derived gas in Junggar Basin, NW China

Petroleum Exploration and Development, 2009
Carboniferous and Jurassic coal-measure rocks with their relative coal-formed gas are developed in Junggar Basin. Carboniferous source rocks have high organic material abundance, Type III organic material, and high maturity.
Li Jian, Jiang Zhenglong, Luo Xia, Wang Dongliang, Han Zhongxi   +4 more
doaj   +1 more source

A Rapid Synchronous Determination Method for Soil Inorganic Carbon Content and its Carbon Isotope Ratio

Journal of Isotopes
The accumulation and leaching of soil inorganic carbon (SIC) play crucial roles in the global carbon balance and represent a key research focus in carbon cycling studies. Accurate quantification of SIC content and its stable isotope ratio is critical for
Zhen HE, Hongzhao YUAN, Liping ZHANG, Meimei GENG, Liwei XU, Chunyong LI, Can PENG, Wen CHEN, Siyu TANG, Huan ZHONG, Jiurong WANG   +10 more
doaj   +1 more source

A STUDY ON CARBON ISOTOPE OF CO₂ AND CH₄ IN WESTERN DIENG PLATEU BY GAS CHROMATOGRAPHY- ISOTOPE RATIO MASS SPECTROMETER (GC-IRMS)

Indonesian Journal of Chemistry, 2010
The carbon isotope can be used to evaluate volcanism phenomenon of volcano. The study of carbon isotope of CO2 and CH4 was carried out in western Dieng Plateau by mass-spectrometer.
Hanik Humaida
doaj   +1 more source