EDS (Energy Dispersive X-Ray Spectroscopy) Elemental Analysis Testing
Energy Dispersive X-ray Spectroscopy (EDS), also known as Energy Dispersive X-ray Analysis (EDAX or EDX), is a chemical characterization method used in testing labs for the elemental analysis of a solid material. To assess a sample's properties, the EDS spectrum recorded for the sample is analyzed. The best material testing laboratory services are offered by Infinita Lab to customers in the USA and other countries.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
Energy Dispersive X-Ray Spectroscopy (EDS) is an elemental analysis technique coupled with scanning electron microscopy (SEM) to identify and quantify the elemental composition of materials at the micro- and nanoscale. When a focused electron beam strikes the sample, characteristic X-rays are emitted from each element, and the EDS detector captures their energies to produce elemental spectra and maps.
EDS provides rapid, spatially resolved elemental information without the need for complex sample preparation, making it a cornerstone technique in materials science, failure analysis, and quality control.
Scope, Applications, and Benefits
Scope
Energy Dispersive Spectroscopy (EDS) is a widely used analytical technique for evaluating the qualitative and semi-quantitative elemental composition of materials, typically for elements with atomic number greater than 4 (Z > 4). It helps identify the presence and approximate concentration of elements within a sample, making it highly valuable for material characterisation, failure analysis, and quality control.
EDS can be used for multiple forms of elemental investigation, including:
- Point analysis to determine the elemental composition at a specific location
- Line scans to study elemental variation across a defined path
- 2D elemental mapping for visualising the spatial distribution of elements across the sample surface
- Surface and subsurface distribution analysis to assess how elements are dispersed within near-surface regions
- Inclusion, phase, and contamination identification to detect foreign particles, distinguish material phases, and trace impurities
Applications
- Metals and alloy composition verification
- Coating and thin film elemental profiling
- Failure analysis and contamination identification
- Geological and mineralogical characterisation
- Semiconductor device defect analysis
Benefits
- Rapid elemental identification (seconds to minutes per point)
- Non-destructive analysis on SEM-prepared specimens
- Simultaneous multi-element detection
- Spatial resolution down to ~1 µm (beam dependent)
- Integrates seamlessly with SEM imaging workflows
Test Process
Sample Preparation
Specimens are mounted, cross-sectioned if required, and carbon- or gold-coated to ensure surface conductivity for SEM-EDS analysis.
1SEM Imaging
The region of interest is located and imaged by the SEM at appropriate accelerating voltage (typically 10–20 kV).
2X-Ray Acquisition
The EDS detector collects characteristic X-rays from selected points, lines, or areas; spectra are acquired for 30–300 seconds per analysis.
3Data Processing
Spectra are processed using peak identification and quantification software to report elemental concentrations.
4Technical Specifications
| Parameter | Details |
|---|---|
| Detectable Elements | Boron (Z=5) to Uranium (Z=92) |
| Energy Resolution | ~125 eV (Si-drift detector) |
| Spatial Resolution | ~0.5–2 µm (material/voltage dependent) |
| Detection Limit | ~0.1–1 wt% |
Instrumentation Used for Testing
- SEM with integrated EDS detector (Si-drift detector)
- Carbon/gold sputter coater
- Elemental standards for quantification
- EDS analysis software (Oxford Aztec, Bruker Esprit, etc.)
- Energy calibration reference materials
Results and Deliverables
- Elemental spectra with peak identification
- Semi-quantitative elemental composition tables (wt% and at%)
- 2D elemental maps and line scan profiles
- Phase and inclusion identification
- Full analytical report with SEM micrographs
Why Choose Infinita Lab for EDS?
At the core of this breadth is our network of 2,000+ accredited labs in the USA, offering access to over 10,000 test types. From advanced metrology (SEM, TEM, RBS, XPS) to mechanical, dielectric, environmental, and standardised ASTM/ISO testing, we give clients unmatched flexibility, specialisation, and scale. You’re not limited by geography, facility, or methodology—Infinita connects you to the right testing, every time.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote
Frequently Asked Questions
EDS can detect elements from boron (Z=5) to uranium (Z=92). Light elements such as hydrogen, helium, and lithium cannot be detected as they do not produce characteristic X-rays of sufficient energy.
EDS provides semi-quantitative results with typical accuracy of ±1–2 wt% when using appropriate standards and matrix corrections (ZAF or φ(ρz)). For high-accuracy quantification, WDS (wavelength dispersive spectroscopy) is recommended.
EDS offers high spatial resolution at the micron scale, while XRF analyses larger bulk areas (mm to cm). EDS is preferred for localized defect or phase analysis; XRF is better for bulk elemental screening.
Yes, but non-conductive materials require a thin conductive coating (carbon or gold) to prevent charge buildup during electron beam exposure that would otherwise distort imaging and spectral data.
EDS provides qualitative and semi-quantitative elemental composition, point analysis, line scans, elemental mapping, contamination detection, and phase or inclusion identification.
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