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Membrane Inlet Mass Spectrometry Method (Reox/Mims) To Measure 15n-Nitrate In Isotope-Enrichment Experiments, Xianbiao Lin, Kaijun Lu, Amber K. Hardison, Et Al

VIMS Articles

Using ¹⁵N stable isotope as a tracer to quantify N transformation rates in isotope-enrichment experiments improves understanding of the N cycle in various ecosystems. However, measuring ¹⁵N-nitrate (¹⁵NO₃⁻) in small volumes of water for these experiments is a major challenge due to the inconvenience of preparing samples by traditional techniques. We developed a “REOX/MIMS” method by applying membrane inlet mass spectrometry (MIMS) to determining ¹⁵NO₃⁻ concentrations in a small volumes of water from isotope-enrichment experiments after converting the dissolved inorganic N to N₂. The nitrates (NO₃^{− …}