NO Reduction to N2O Improves Nitrate 15N Abundance Analysis by Membrane Inlet Quadrupole Mass Spectrometry
- Wolfram Eschenbach*Wolfram Eschenbach*E-mail: [email protected]Centre for Stable Isotope Research and Analysis, University of Göttingen, 37077 Göttingen, GermanyMore by Wolfram Eschenbach
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- Reinhard WellReinhard WellThünen-Institut of Climate-Smart Agriculture, Bundesallee 50, 38116 Braunschweig, GermanyMore by Reinhard Well
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- Jens DyckmansJens DyckmansCentre for Stable Isotope Research and Analysis, University of Göttingen, 37077 Göttingen, GermanyMore by Jens Dyckmans
Abstract
Earlier an automated sample preparation unit for inorganic nitrogen (SPIN) coupled to a membrane inlet quadrupole mass spectrometer (MIMS) was developed for automated and sensitive determination of the 15N abundances and concentrations of nitrate, nitrite and ammonium of aqueous solutions without any sample preparation. Here we describe an alternative analytical protocol to convert NO3– to N2O instead of NO before measurement. This is advantageous because NO strongly interacts with surfaces, requires long purge times, and still shows considerable carryover between samples, all of which is avoided when N2O is used as analyte. The sensitivity of the measurement of NO3– as N2O is comparable to the earlier measurements with NO as analyte.
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This article is cited by 7 publications.
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