Gunshot Residue Analysis Techniques in Forensic Science

Gunshot residue (GSR) analysis remains a cornerstone of forensic investigations involving firearms. Traditional approaches focus on the inorganic fraction, typically detected by scanning electron microscopy with energy dispersive X-ray spectrometry (SEM-EDX) to identify characteristic particles containing lead, barium and antimony. Recent shifts towards heavy-metal-free ammunition have driven the emergence of organic GSR (OGSR) methodologies, employing chromatographic and spectrometric techniques to detect nitrocellulose, nitroglycerine and stabilisers. Electrochemical sensors, laser-based spectroscopies and ion beam analysis now complement classical protocols, offering enhanced sensitivity, portability and non-destructive sampling. Analytical advances are paralleled by studies of particle transfer dynamics, which inform interpretation of primary, secondary and tertiary contamination. Validation frameworks and automated data acquisition seek to harmonise instrument performance and support robust source attribution. Together, these developments reflect a global imperative to refine detection limits, improve distance estimation, and strengthen the evidential value of GSR in crime-scene reconstruction.

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Gunshot Residue Analysis Techniques in Forensic Science publication trend

The graph below shows the total number of articles in gunshot residue analysis techniques in forensic science across all publications each year (not limited to Nature Index journals).

Technical terms

Gunshot residue (GSR): Particles and chemical compounds ejected when a firearm is discharged.

Inorganic GSR (IGSR): Metal-rich particles, typically containing lead, barium and antimony, detected by SEM-EDX.

Organic GSR (OGSR): Carbon-based constituents of propellant, including nitrocellulose, nitroglycerine and stabilisers.

SEM-EDX: Scanning electron microscopy coupled with energy dispersive X-ray spectrometry for elemental analysis of microscopic particles.

Differential pulse voltammetry (DPV): Electrochemical technique measuring current response to incremental voltage pulses for sensitive analyte detection.

Gas chromatography–mass spectrometry (GC-MS): Chromatographic separation and mass-based identification of volatile and semi-volatile compounds.

References

1. Electroanalysis of ethyl-centralite propellant stabiliser at magnetic nanoparticle modified glassy carbon and screen-printed electrodes with extension to forensic firearm residue analysis. Sensors and Actuators B Chemical (2023).
2. A simple voltammetric method to evaluate the firing distance through determination of nitrocellulose. Talanta (2023).
3. Forensic profiling of smokeless powders (SLPs) by gas chromatography–mass spectrometry (GC-MS): a systematic investigation into injector conditions and their effect on the characterisation of samples. Analytical and Bioanalytical Chemistry (2024).
4. Gunshot residue detection technologies—a review. Egyptian Journal of Forensic Sciences (2021).
5. An experimental investigation of the indirect transfer and deposition of gunshot residue: Further studies carried out with SEM–EDX analysis. Forensic Science International (2014).
6. The secondary transfer of gunshot residue: an experimental investigation carried out with SEM‐EDX analysis. X-Ray Spectrometry (2013).
7. A new quantitative method for gunshot residue analysis by ion beam analysis. Analyst (2013).