Precise isotopic measurements of sub-nanogram Nd of standard reference material by thermal ionization mass spectrometry using the NdO+ technique (CAT#: STEM-ST-0200-LJX)

Introduction

The Sm–Nd isotopic system, one of the important techniques for dating and geochemical tracing, has been widely used in geosciences. Precise and accurate measurements of Nd isotopic ratios are more difficult to achieve for microsamples that contain less than 50 ng Nd, when routine Nd+ technique is applied on thermal ionization mass spectrometer (TIMS). Compared to Nd+ technique, the NdO+ technique, owing to more efficient ionization, is a better choice for high precision measurements of Nd isotopic ratios of micro- or low-content samples.

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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:
Nd

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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