China Stable isotope 15N I GB Standards Search Result |
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GB/T 42488-2023 Soil quality - Determination of 15N abundance of inorganic nitrogen in soil - Stable isotope ratio mass spectrometry 土壤质量 土壤中无机态氮15N丰度的测定 稳定同位素比值质谱法 - 中英文版 |
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GB/T 20622-2006 Stable isotope 15N Inorganic labelled compound 稳定性同位素15N无机标记化合物 - 中英文版 |
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