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This research aims to develop a continuous-flow isotope ratio mass spectrometer (P&T-IRMS) for analyzing stable nitrate isotopes in water.

Establishment of a Purge and Trap Continuous‐Flow Isotope Ratio Mass Spectrometer System for Analysis of Stable Nitrate Isotopes (δ 15 N and δ 18 O) in Water Samples by Ti(III) Reduction

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Automated analysis of stable nitrate isotopes in water uses a new method, indicating high accuracy for laboratory application.

This research aims to develop a continuous-flow isotope ratio mass spectrometer (P&T-IRMS) for analyzing stable nitrate isotopes in water.
Development of a purge-and-trap isotope ratio mass spectrometer system.
Application of Ti(III) reduction for converting aqueous nitrate to N2O gas for analysis.
Evaluation of measurement precision and comparison with established methods.
Base analytical precision for δ15N was ±0.3‰ and for δ18O was ±0.2‰.
Limit of quantification for N2O gas standard was 1 μL L−1 for both isotopes.
Comparison with EA-IRMS values demonstrated high accuracy for δ15N and δ18O measurements.

Gcakasi et al. (2026) studied this question.

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