搜索结果: 1-7 共查到“知识库 地球化学 helium”相关记录7条 . 查询时间(0.18 秒)
Simultaneous and sensitive analysis of inorganic and organic gaseous compounds by pulsed discharge helium ionization detector (PDHID)
micropacked column simultaneous and sensitive analysis organic gases inorganic gases
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2017/4/11
A simple gas chromatographic method has been developed for the simultaneous and sensitive analysis of inorganic
(H2, CO, and CO2) and organic gaseous compounds (CH4, C2H4, C2H6, C3H6, C3H8, iso-C4H10...
Helium isotopes of seawater in the Philippine Sea and the western North Pacific
3He/4He ratios abyssal current Philippine Sea North Pacific seawater
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2017/8/9
We measured helium isotopic ratios of 84 seawater samples from various depths collected in the western North Pacific Ocean and the western Philippine Sea. The 3He/4He ratios varied significantly from ...
Monitoring of temporal and spatial variations in fumarole helium and carbon dioxide characteristics at Poás and Turrialba volcanoes, Costa Rica (2001-2009)
helium isotopes carbon isotopes Central America Costa Rica volcano monitoring
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2017/8/9
We report results of a 9-year monitoring program that took place from 2001 to 2009 of the helium and carbon isotope (3He/4He, δ13C) and relative abundances ratios (CO2/3He) of fumarole sites at Poás a...
Helium in old porcelain: The historical variation of the He isotopic composition in air
helium isotopes atmosphere porcelain anthropogenic fluxes Industrial Revolution
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2017/8/9
It is still debated whether there is a variation of the atmospheric 3He/4He ratio, due to the anthropogenic release of radiogenic 4He contained in fossil fuels, in modern era. In this study, we measur...
Helium isotopic ratios in fluid inclusions from fluorite-rich Mississippi Valley-Type district of Asturias, northern Spain
fluorite noble gases helium isotopes fluid inclusions Asturias, MVT deposits
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2017/8/9
Helium isotopes have been measured in fluorite and sulphides from fluorite-rich Mississippi Valley-type (MVT) deposits from Asturias, Spain, in order to assess the involvement of mantle and crust-deri...
Soil-gas radon/helium surveys in some neotectonic areas of NW Himalayan foothills, India
Soil-gas radon helium neotectonic areas
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2010/10/20
The present research is aimed at accessing the relationship between variation in the soil gases radon (222Rn) and helium (4He) and recently developed fissures and other neotectonic features in Nurpur ...
Relationship between geological structure and helium isotopes in deep groundwater from the Osaka Basin: Application to deep groundwater hydrology
helium isotopes noble gas groundwater hydrology Osaka basin
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2017/8/10
The relationship between geological structure and helium isotopes is discussed for deep groundwaters from the Osaka sedimentary basin, southwest Japan, to understand dissolved He in groundwater for hy...