Preparing samples for XRF analysis is crucial for obtaining accurate and reproducible results.
The method you choose depends on the type of sample and the level of accuracy and reproducibility you need.
Here are five common methods for preparing samples for XRF analysis:
1. Grinding and Polishing
For solid samples like metals, the first step is to polish the sample to get a smooth, flat surface.
Grinding tools are used for hard metals like iron and steel.
A lathe or milling machine can be used for softer metals like copper and aluminum alloys.
This ensures a consistent distance from the sample to the x-ray source, minimizing errors in the analysis.
2. Loose or Pressed Powders
Powders can be used for samples that are difficult to prepare as solid samples.
These powders can be loose or pressed into pellets or discs for analysis.
Loose powders are prepared by grinding the sample into a fine powder.
Pressed powders involve using a hydraulic press to create a pellet or disc from the powder.
3. Fused Beads
Fused beads are commonly used for samples that are not easily ground into powders, such as rocks or minerals.
The sample is mixed with a fluxing agent and heated to high temperatures to create a homogeneous glass bead.
This method ensures complete sample dissolution and accurate analysis.
4. Liquids
XRF analysis can also be performed on liquid samples, such as petroleum products.
These samples can be directly analyzed without any sample preparation, as long as they are in a suitable container for XRF analysis.
5. Cut and Polished Metal Samples
For more quantitative analysis of metal alloys, samples can be cut and polished to obtain a flat surface.
This ensures accurate and reproducible results, especially for alloys with different compositions.
Continue exploring, consult our experts
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