EDS

What Is EDS (EDX)?

EDS (Energy-Dispersive X-ray Spectroscopy), also called EDX, is an electron microscope–based elemental analysis technique typically integrated with SEM (and sometimes TEM/STEM). When the electron beam hits a sample, it generates characteristic X-rays. EDS measures those X-rays to identify which elements are present and to estimate their relative amounts (semi-quantitative, project-dependent).

EDS is a go-to method for fast answers to questions like: “What is this particle?” “What elements are in this residue?” “Is this layer rich in specific elements?”—especially when you need results tied directly to high-magnification images.

What EDS Is Used For

EDS is commonly used to:

Identify unknown particles / foreign material (dust, debris, black specks, filter solids)
Determine whether a residue is primarily inorganic (salts, oxides, fillers) vs largely organic (limited elemental signature)
Evaluate corrosion products and scale (e.g., Fe oxides, chlorides/sulfates—project-dependent)
Check coating and plating composition (qualitative/semi-quantitative)
Map element distribution across features, interfaces, and cross-sections (project-dependent)
Support root-cause comparisons (good vs bad parts, before vs after cleaning/process changes)

Why EDS (and What It Can’t Do)

Why teams choose EDS

Provides direct elemental evidence linked to a microscope image
Enables micro-area analysis exactly where the issue is located
Fast triage to decide the next best technique

Key limitations

EDS measures elements, not molecules—so it cannot identify specific organic compounds.
Very light elements are challenging (especially H; Li detection is setup-dependent).
Typically semi-quantitative unless standards and controlled geometry are used (project-dependent).
Not ideal for ultra-trace bulk contamination—use ICP-MS / GD-MS when you need ppm/ppb-level bulk numbers.

Sample Types We Support

EDS is widely applicable (project-dependent), including:

Particles & debris: powders, filter solids, deposits, inclusions
Metals & alloys: corrosion sites, weld/HAZ regions, fracture surfaces
Polymers & composites: filler analysis, inclusions, contamination particles
Coatings & thin films: plated layers, barrier coatings, paint flakes (thickness dependent)
Semiconductors & electronics: device defects, residues, metallization features (project-dependent)
Minerals/ceramics: elemental screening and micro-area checks (often paired with XRD)

Best practice: include a reference/control sample for “what changed?” studies.

Typical Workflows

Particle / Foreign Material Identification (Most Common)

Best for: “What is this speck/debris?”

Locate particle under SEM
EDS point analysis for elemental ID
Optional elemental maps to show distribution
Interpretation: likely source category (wear metal, scale, filler, environmental dust, etc.)

Layer / Interface Element Mapping

Best for: coatings, plating, diffusion layers

Surface or cross-section imaging (cross-section prep may be mechanical or FIB, project-dependent)
EDS line scans/maps across interfaces
Qualitative interpretation of layer contrast and gradients (quant is project-dependent)

Comparative Study (Good vs Bad)

Best for: contamination excursions and process changes

Same measurement plan across samples
Side-by-side spectra and maps
Summary of differentiating elements and likely significance

What You Receive

SEM images with ROI markings and scale bars
EDS spectra and identified elements
Semi-quant tables and/or element maps/line scans (scope-dependent)
A clear interpretation: what it is, what changed vs reference, and recommended next steps

Sample Submission Guidelines

Please provide

Sample description and your key question (particle ID, corrosion, coating, comparison)
Where the issue is located (photos/marking/orientation)
Any known materials or stack information (substrate/coating types)
Reference/control sample whenever possible

Packaging tips

Protect surfaces from rubbing and fingerprints (gloves + clean bags)
For loose particles, secure in a clean vial or on clean tape (project-dependent)
For fracture surfaces, protect the origin area from contact

FAQs

Can EDS identify organics?

Not directly. EDS cannot identify specific organic molecules. It can help determine whether a residue is likely inorganic (strong elemental peaks) or mostly organic (often dominated by C/O). For organic ID, we recommend FTIR, Raman, GC-MS, LC-MS, or Py-GC/MS.

EDS