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Updated: Jul 27, 2026

Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method
08:25

Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method

Published on: December 25, 2016

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一个原理证明研究 δ15N 用修改的LC-IRMS接口测量水溶酸

Tobias Hesse1,2, Felix Niemann1, Shaista Khaliq1

  • 1Instrumental Analytical Chemistry, University of Duisburg-Essen, Essen, Germany.

Rapid communications in mass spectrometry : RCM
|November 26, 2024
PubMed
概括

本研究介绍了一种自动化方法,用于测量酸盐中的同位素,使用修改后的液体染色学-同位素比质谱学 (LC-IRMS) 系统. 新技术简化了酸盐分析,用于识别污染源和研究循环.

关键词:
在CSIA中,CSIA是最重要的.在 LC-IRMS 中.在S 15N-NO3中.酸盐酸盐的使用方法稳定的同位素 稳定的同位素δ15NN 15NN 在线观看

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O08:05

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¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...