Total Reflection X-Ray Fluorescence Analysis and Applications

Total reflection X-ray fluorescence (TXRF) is an advanced spectroscopic method for multi-element detection at trace and ultra-trace levels. By directing a monochromatic X-ray beam at a sample substrate below the critical angle for total external reflection, background scattering is minimised and the sensitivity for fluorescence signals is maximised. Samples, typically deposited as microdroplets or thin films on optically flat carriers, require minimal preparation and only microlitre volumes. An internal standard element is added to each deposition, enabling direct quantification without repeated calibration. Detection limits often reach picogram quantities, rendering TXRF ideal for environmental monitoring of heavy metals, clinical assays of trace biometals, quality control in material science and contamination screening in semiconductor manufacturing. Its non-destructive character, combined with rapid analysis times and simultaneous multi-element capability, has spurred adoption across diverse fields. Recent developments have focused on refining sample deposition techniques, automating measurement workflows, extending portable instrumentation and integrating synchrotron-based beamlines for submicrometre spatial resolution. As a complement to atomic absorption or mass spectrometric methods, TXRF delivers robust performance where minimal sample volume, low background and multi-element throughput are paramount. Ongoing research continues to enhance quantification accuracy, adapt to complex matrices and explore novel applications in forensics, food safety and nanomaterials.*

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Comparative investigations in murine liver tissue have demonstrated that TXRF, when combined with a simple lysis protocol, matches the performance of conventional ICP-MS/MS for iron, copper, zinc and selenium determination. These studies validate TXRF as a rapid, low-volume alternative for multi-element assays in small biological samples, preserving the possibility of downstream analyses.

Environmental assessments have employed TXRF alongside wavelength-dispersive XRF to map trace and major elements in soils and pine needles around industrial sites. By applying acid digestion, suspension preparation and certified reference materials, researchers achieved precise quantification of oxides and heavy metals, revealing contamination gradients linked to aluminium production and thermal power emissions.

Innovations in sample preparation, notably the use of simple dilution or suspension protocols for clinical specimens, have been critically evaluated for multielement analysis of human fluids. These protocols achieve low detection limits, high trueness and precision, and minimal matrix effects, providing a practical basis for future biomedical and nutritional studies using TXRF.

Total Reflection X-Ray Fluorescence Analysis and Applications publication trend

The graph below shows the total number of articles in total reflection x-ray fluorescence analysis and applications across all publications each year (not limited to Nature Index journals).

Technical terms

Total reflection X-ray fluorescence (TXRF): An elemental analysis technique in which X-rays striking a sample below the critical angle are totally reflected, reducing background and enhancing sensitivity.

Critical angle: The maximum incident angle at which total external reflection of X-rays occurs at the interface between the substrate and air.

Internal standard: A reference element added in known quantity to each sample to enable direct quantification of all analytes without separate calibration curves.

Detection limit: The smallest quantity of an element that can be reliably distinguished from background noise in a TXRF measurement.

Multielement analysis: The simultaneous determination of multiple chemical elements in a single measurement, a core advantage of TXRF.

References

1. Potential of total‐reflection X‐ray spectrometry for multielement analysis of biological samples using dilution or suspension sample preparation techniques. X-Ray Spectrometry (2021).
2. Measurement of trace elements in murine liver tissue samples: Comparison between ICP-MS/MS and TXRF. Journal of Trace Elements in Medicine and Biology (2023).
3. Investigation of Soils and Pine Needles Using WDXRF and TXRF Techniques for Assessment of the Environmental Pollution of Shelekhov District, Eastern Siberia, by the Aluminum Industry and Heat Power Engineering. Agronomy (2022).