Determination of NO2 by negative thermal ionization mass spectrometry (CAT#: STEM-ST-0247-LJX)

Introduction

For the first time, the production of negative nitrogen dioxide thermal ions is used to measure nitrogen dioxide in a mass spectrometer after conversion into nitrate. We investigated the dependence of the ion intensity on the temperature and the material of the ionization filament in a double-filament ion source with sodium nitrate, lead nitrate and nitron nitrate as chemical compounds. The isotope dilution technique can be applied for the standardization of other analytical methods. The relative external standard deviation of the isotope ratio measurement is in the range of 0.02%. The possible applications of isotope dilution mass spectrometry using negative nitrogen dioxide thermal ions to determine NOx, nitrite and nitrate are discussed.

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Principle Applications Procedure Materials Notes Related Products

Principle

Thermal ionization mass spectrometry exploits the thermochemical reactions that occur in molecules in a sample when they are irradiated by a beam of high energy electrons. This reaction usually takes place at high temperatures, resulting in the formation of ions. The ionized species are accelerated in an electric field and then analyzed by mass spectrometry through the ion-focusing lens of a mass spectrometer. The mass spectrometer will separate and detect the ions according to their mass and charge.

Applications

For analyzing the distribution of molecules, atoms and molecular groups.
For studying the chemical structure of Earth's minerals and rocks.
For studying the structure and function of biomolecules.
For studying problems in physics.

Procedure

1. The sampling system sends the sample to be analyzed into the ion source;
2. The ion source ionizes the atoms and molecules in the sample into ions;
3. The mass analyzer separates ions according to the size of the mass-charge ratio;
4. The detector is used to measure and record the intensity of the ion current to obtain the mass spectrum.

Materials

• Sample Type:
NO2

Notes

Before starting the machine, check whether the water (water cooler), electricity, gas (argon/nitrogen), temperature, humidity, and exhaust air of the instrument are normal.

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