Correcting for Methane Interferences on δ2H and δ18O Measurements in Pore Water Using H2O(liquid)–H2O(vapor) Equilibration Laser Spectroscopy
作者： M. Jim Hendry , B. Richman , L.I. Wassenaar
DOI: 10.1021/AC201341P
关键词: Correction method 、 Chemistry 、 Mineralogy 、 Groundwater 、 Isotope analysis 、 Analytical chemistry 、 Spectroscopy 、 δ18O 、 Methane 、 Spectral line 、 Pore water pressure
摘要: Cavity ring-down spectroscopy (CRDS) is a new and evolving technology that shows great promise for isotopic δ18O δ2H analyses of pore water from equilibrated headspace H2O vapor environmental geologic cores. We show naturally occurring levels CH4 can seriously interfere with CRDS spectra, leading to erroneous results water. created correction algorithm account concentrations typically observed in subsurface anaerobic environments, such as ground waters or lake bottom sediments. subsequently applied the method series cores contain CH4. The overcomes spectral interference provides accurate values acceptable precision well
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