Pretreatment method and determination method for determination of nitrogen and oxygen isotopes by chemical conversion method
A chemical conversion and isotope technology, applied in the preparation of test samples, measuring devices, scientific instruments, etc., can solve problems such as poor test stability, and achieve the effect of eliminating interference, reducing interference, and improving operability
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Embodiment 1
[0072] The chemical conversion method of the present embodiment measures the pretreatment method of nitrogen and oxygen isotope, comprises the steps:
[0073] (1) Preparation of sodium azide-acetic acid buffer solution: Weigh 6.501g of sodium azide solid (GR) and dissolve it in 25mL of ultrapure water to 50mL, add the same volume of 20% acetic acid solution, mix well to obtain Sodium nitride-acetic acid buffer solution;
[0074] Wherein, the preparation method of 20% acetic acid solution is: get glacial acetic acid (GR), mix with ultrapure water with the volume ratio of 1:4, obtain 20% acetic acid solution;
[0075] (2) Refrigerating the sodium azide-acetic acid buffer solution obtained in step (1) for 4 hours at 0-4° C. to obtain the treated sodium azide-acetic acid buffer solution.
Embodiment 2
[0077] The chemical conversion method of the present embodiment measures the pretreatment method of nitrogen and oxygen isotope, comprises the steps:
[0078] (1) Preparation of sodium azide-acetic acid buffer solution: Weigh 6.501g of sodium azide solid (GR) and dissolve it in 25mL of ultrapure water to 50mL, add the same volume of 20% acetic acid solution, mix well to obtain Sodium nitride-acetic acid buffer solution;
[0079] Wherein, the preparation method of 20% acetic acid solution is: get glacial acetic acid (GR), mix with ultrapure water with the volume ratio of 1:4, obtain 20% acetic acid solution;
[0080] (2) Treat the sodium azide-acetic acid buffer solution obtained in step (1) at a low temperature for 4 hours at 5-10° C. to obtain the treated sodium azide-acetic acid buffer solution.
Embodiment 3
[0082] The chemical conversion method of the present embodiment measures the pretreatment method of nitrogen and oxygen isotope, comprises the steps:
[0083] (1) Preparation of sodium azide-acetic acid buffer solution: Weigh 6.501g of sodium azide solid (GR) and dissolve it in 25mL of ultrapure water to 50mL, add the same volume of 20% acetic acid solution, mix well to obtain Sodium nitride-acetic acid buffer solution;
[0084] Wherein, the preparation method of 20% acetic acid solution is: get glacial acetic acid (GR), mix with ultrapure water with the volume ratio of 1:4, obtain 20% acetic acid solution;
[0085] (2) The sodium azide-acetic acid buffer solution obtained in step (1) is purged with helium for 4 hours, and then refrigerated for 4 hours at 0-4 ° C to obtain the treated sodium azide-acetic acid buffer solution.
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