Chlorine stable isotope measurements of chlorinated aliphatic hydrocarbons by thermal ionization mass spectrometry (CAT#: STEM-ST-0243-LJX)

Introduction

Soil and groundwater contamination with chlorinated aliphatic hydrocarbons (CAHs) is found in many industrial and residential areas. Although, some CAHs are suspected to be carcinogens and mutagens, it is difficult to identify the sources of subsurface pollution and to evaluate the effectiveness of clean-up technologies because of limited monitoring points and frequency, and the complex behavior of CAHs in subsurface environments.
The isotopic composition of elements, such as carbon, nitrogen, sulfur, boron, selenium, and lead are useful indicators for tracing the sources of pollutants and their reactions in the field. The ratios of two stable Cl isotopes (37Cl/35Cl) can be used for a similar purposes.

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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:
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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