Matrix Effect
Definition
The absorption or enhancement of characteristic X-rays by other elements in the same sample, causing apparent concentrations to deviate from true values if not mathematically corrected.
- Technique affected
- X-ray fluorescence (XRF)
- Mechanism
- Absorption or enhancement of X-rays by other elements
- Consequence
- Apparent concentrations deviate from true values
- Correction
- Mathematical matrix-correction models
Common questions
Why can two soil samples with identical trace-element content give different XRF readings?+
If their bulk composition differs, elements present in one sample can absorb or fluoresce the X-rays from another element differently than in the second sample, shifting the measured intensity even though the true concentration is the same.
How is the matrix effect corrected in practice?+
Analysts apply mathematical correction models such as fundamental parameters or empirical calibration against matrix-matched standards, rather than reading raw intensity directly as concentration.
Related terms
- Energy-Dispersive XRF (ED-XRF)
- An XRF configuration using a solid-state detector that registers all emitted photon energies simultaneously. Faster and more compact than WD-XRF, enabling portable...
- Fused Bead
- A preparation method where soil is dissolved in molten lithium tetraborate or metaborate flux at around 1100 degrees Celsius to form a...
- Pressed Pellet
- A sample preparation form in which finely ground, dried soil is mixed with a binder and compressed under several tonnes of pressure...
- Wavelength-Dispersive XRF (WD-XRF)
- An XRF configuration that uses an analysing crystal to separate emitted X-rays by wavelength before detection, giving high spectral resolution and low...
- X-Ray Fluorescence (XRF)
- A technique in which a sample is irradiated with a primary X-ray beam, causing its constituent elements to emit characteristic secondary (fluorescent)...