Trace element analysis of rare earth elements by spark source mass spectrometry (CAT#: STEM-ST-0288-LJX)

Introduction

The service conducted the trace element analysis of rare earth elements (REE) by spark source mass spectrometry. The REE are typically present in geological materials at levels of a few parts per million. Abundance levels are for chondritic meteorites are presented, where the range in concentration is from 0.031 ppm for Lu up to 0.84ppm for Ce. The abundances in different chondritic meteorites show close relative and absolute similarities; this uniformity indicates that the chondrites display the relative REE abundance patterns of the primordial solar nebula. The second abundance pattern, which is also uniform is that displayed by sedimentary rocks. The inherent usefulness of the REE for geochemical investigations is mainly because of the smooth variation in ionic radii of the trivalent ions. Principles of spark source mass spectrometry are discussed in the chapter.

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Principle Applications Procedure Materials Notes Related Products

Principle

By using vacuum spark discharge, the energy accumulated in a small volume can make the material in the volume suddenly evaporate and ionize, so as to obtain the characteristic ion current information.

Applications

(1) Solid spark source mass spectrometry: impurity analysis of high-purity materials, which can be applied to semiconductor materials, non-ferrous metals, and building materials industries;
(2) Gas isotope mass spectrometry: determination of stable isotopes C, H, N, O, S and radioactive isotopes Rb, Sr, U, Pb, K, Ar, which can be applied to geology, petroleum, medicine, environmental protection and agriculture.

Procedure

(1) An electric field is applied between the electrodes to ionize part of the carrier gas (such as argon) in the electric field;
(2) The "cathode ray" or "anode ray" generated by ionization accelerates in the direction of the opposite polarity in the residual gas, bombards the anode or cathode, and vaporizes a part of the substance to be measured on the plate;
(3) Part of the atoms of the vaporized substance are ionized in the subsequent discharge process.

Materials

• Sample Type:
Rare earth elements

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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