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A method using a high‐temperature sealed‐tube combustion technique coupled with a continuous‐flow isotope‐ratio mass spectrometer (CF‐IRMS) was developed in this study to accurately determine the nitrogen mass fractions and δ15N of silicate rocks with a low nitrogen mass fraction of < 200 μg g−1. Analysis of reference material (HBa3) demonstrated that the nitrogen mass fraction and δ15N results...
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