NO Reduction to N2O Improves Nitrate 15N Abundance Analysis by Membrane Inlet Quadrupole Mass Spectrometry.
NO Reduction to N2O Improves Nitrate 15N Abundance Analysis by Membrane Inlet Quadrupole Mass Spectrometry.
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DOI：
10.1021/acs.analchem.8b02956
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发表时间：
2018-09
影响因子：
7.4
通讯作者：
W. Eschenbach;R. Well;J. Dyckmans
中科院分区：
文献类型：
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作者：
W. Eschenbach;R. Well;J. Dyckmans
早期的自动样品制备单元无机氮（SPIN）耦合到膜入口四极杆质谱仪（MIMS）的自动化和灵敏的测定15 N丰度和浓度的硝酸盐，亚硝酸盐和铵的水溶液中，没有任何样品制备。在这里，我们描述了一种替代的分析协议，将NO3-N2 O，而不是NO测量前。这是有利的，因为NO强烈地与表面相互作用，需要长的吹扫时间，并且在样品之间仍然显示出相当大的携带，当N2 O用作分析物时，所有这些都被避免。NO3-作为N2 O的测量的灵敏度与以NO作为分析物的早期测量相当。
Earlier an automated sample preparation unit for inorganic nitrogen (SPIN) coupled to a membrane inlet quadrupole mass spectrometer (MIMS) was developed for automated and sensitive determination of the 15N abundances and concentrations of nitrate, nitrite and ammonium of aqueous solutions without any sample preparation. Here we describe an alternative analytical protocol to convert NO3- to N2O instead of NO before measurement. This is advantageous because NO strongly interacts with surfaces, requires long purge times, and still shows considerable carryover between samples, all of which is avoided when N2O is used as analyte. The sensitivity of the measurement of NO3- as N2O is comparable to the earlier measurements with NO as analyte.