Analysis of molybdenum isotopes by thermal ionization mass spectrometry (CAT#: STEM-ST-0212-LJX)

Introduction

Molybdenum has an atomic number of 42 and seven stable isotopes, 92Mo, 94Mo, 95Mo, 96Mo, 97Mo, 98Mo, and 100Mo. Molybdenum is an essential micronutrient for both plants and animals, and is present at concentrations ranging from ppb to ppm levels. High sensitivity stable isotope tracer studies can play an important role in the study of molybdenum metabolism and biogeochemical processes. Molybdenum isotope abundance ratios are measured effectively by thermal ionization mass spectrometry, where the ionization of molybdenum occurs at or near the surface of a hot metallic filament.

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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:
Molybdenum

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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