Microssonda Eletrônica
Caracterização detalhada por Microssonda Eletrônica
O que é EPMA
Uma técnica de análise avançada
Caracterização detalhada por Microssonda Eletrônica
What sets us apart
We don't hand over a spectrum. We hand over the interpretation.
Any lab can return peaks and numbers. Our report reads the data. Three differences define what we deliver — illustrated below with a real, anonymized case.
Multiple techniques, one integrated report
We don't hand back five loose reports. We cross-reference every technique's results into a single reading — each signal checked against the others — to reach an answer, not a pile of data.
- Contamination investigation — identifying and tracing the source of a foreign species.
- Performance degradation — explaining why a batch behaves outside expectations.
- New supplier validation — proving equivalence before switching.
3 LDPE batches · 4 techniques converge, NMR reveals the difference
In semicrystalline polymer systems, thermomechanical processing variables influence chain conformational dynamics¹. Solid-state NMR resolves chemical environments at the nanometer scale², sensitive to changes not detectable by XRD or FTIR³.
Technical justification anchored in the literature
Every technique choice and every inference in the report is backed by peer-reviewed literature — with citations in the text. The conclusion isn't loose opinion: it's a traceable argument, defensible in an audit and in front of the client.
- Numbered citations linking claim to source
- Official standards and methods referenced per analyte
- Auditable reasoning end to end
Conclusion and expert opinion
The report closes with a clear position, signed by the Principal Investigator: what the data shows, what can't yet be claimed, and the next step. It includes an honest caveat on the limits of inference — what separates a technical opinion from a guess.
- Explicit technical position, not just results
- Inference limits declared honestly
- Next-step recommendation signed by the P.I.
Four techniques confirmed equivalence; only the solid-state NMR revealed the subtle conformational change not distinguishable by conventional QC — a molecular signature consistent with the atypical filtration behavior.
Without the industrial line's parameters, no direct causal correlation can be established — a complementary step is recommended for elucidation.
Aplicações de mercado
Onde a EPMA entrega resultados
Market Applications
FAQ
Frequently Asked Questions about Electron Probe Microanalysis (EPMA)
What is Electron Probe Microanalysis (EPMA) and how does it differ from SEM-EDS?
- EPMA is a quantitative elemental microanalysis technique that uses a focused electron beam, like SEM, but relies primarily on wavelength-dispersive spectrometers (WDS) instead of, or alongside, energy-dispersive detectors. WDS separates X-ray wavelengths with much higher spectral resolution than EDS, giving more accurate quantification and lower detection limits, particularly for light elements and elements present at low, trace-level concentrations.
How accurate is EPMA for quantitative elemental analysis compared to EDS?
- Because WDS spectrometers have narrower peak widths and less spectral overlap than EDS detectors, EPMA typically achieves better quantitative accuracy and can resolve elements whose X-ray peaks would overlap and be misidentified or misquantified on an EDS system — making it the standard choice when precise, defensible elemental concentrations are required rather than a qualitative estimate.
What sample preparation does EPMA require?
- EPMA generally requires a flat, polished, and electrically conductive (or conductively coated) sample surface, similar to SEM, since accurate quantification depends on a well-defined, planar analysis point. Sample geometry and surface finish are confirmed before analysis to ensure quantitative results are reliable.
Can EPMA analyze specific points, lines, or full elemental maps?
- Yes — EPMA supports point analysis for precise quantification at a single location, line scans across a feature such as a coating or interface, and full compositional mapping across a region, allowing elemental distribution to be visualized as well as quantified.
What kinds of materials questions is EPMA best suited to answer?
- EPMA is particularly well suited to questions requiring precise, quantitative elemental composition at a specific microscopic location — such as confirming trace-element content, characterizing compositional gradients across an interface or coating, or verifying stoichiometry — where EDS's faster but lower-precision results are not sufficient.
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