Determination of boron and chlorine isotopic compositions in geological materials by negative thermal-ionization mass spectrometry (CAT#: STEM-ST-0206-LJX)

Introduction

The service used a new, simple technique for the rapid and precise determination of boron and chlorine isotopic compositions in some natural materials (e.g., seawater, hypersaline brines, groundwater and calcium carbonate). The high reactivity of B and Cl enables production of BO2− and Cl− ions directly from untreated solutions which are analysed by negative thermal ionization mass spectrometry.<br />The method has been tested on a variety of geological materials including seawater, groundwater, hypersaline brines, water-soluble salts and HCl-soluble minerals and have been found to be applicable to a wide range of water salinities and chemistries.

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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:
Boron and chlorine

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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