Fusion in XRF is a sample preparation method that involves dissolving a fully oxidized sample in a flux at high temperatures. This process creates a glass disk or solution suitable for analysis. This method is particularly beneficial for XRF analysis due to its ability to produce highly accurate and repeatable results, handle a wide variety of sample types, and minimize the effects of mineralogy and particle size on analytical outcomes.
What is Fusion in XRF? 5 Key Benefits Explained
1. Sample Preparation Process
Melting: The sample is fully oxidized and then heated to high temperatures in a crucible made of platinum, zirconium, or graphite. This high-temperature environment allows the sample to dissolve in the flux, which is typically a borate-based material.
Formation of Glass Disk or Solution: Once the sample is fully dissolved, the molten mixture is either poured into a mold to create a glass disk for direct XRF analysis or into a beaker to form a solution for other analytical techniques like AA or ICP.
2. Benefits of Fusion for XRF Analysis
Accuracy and Repeatability: Fusion ensures that the sample is uniformly mixed with the flux, leading to consistent results that are not influenced by the original sample's mineralogy or particle size.
Versatility: This method can handle a wide range of sample types, from polymers to ferroalloys, making it a versatile choice for laboratories.
Efficiency and Cost-Effectiveness: The process is straightforward, fast, and cost-effective, requiring minimal resources and time.
Safety and Cleanliness: Fusion is a clean process that reduces the risk of contamination and is safer compared to other sample preparation techniques.
3. Importance in XRF Analysis
Sample Uniformity: XRF requires a uniform sample to ensure accurate elemental analysis. Fusion provides this uniformity by creating a homogeneous sample disk or solution.
Reduction of Matrix Effects: By creating a uniform sample, fusion minimizes matrix effects that can interfere with the XRF analysis, such as absorption or enhancement of X-rays by different elements in the sample.
Easy Calibration and Matrix Correction: The standardized nature of fused samples simplifies the calibration process and application of matrix corrections in XRF analysis.
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