What Is Inductively Coupled Plasma Optical Emission Spectroscopy?
Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), also called ICP Atomic Emission Spectroscopy (ICP-AES), measures the elemental composition of liquids or digested solid samples.
In ICP-OES, the atoms in an argon plasma are energized, causing them to emit light at element-specific wavelengths, each wavelength indicating a unique fingerprint.
ICP‑OES supports detection at the parts‑per‑billion (ppb) level. At Covalent, every method is built with rigorous control over sample prep, calibration, and spectral interpretation to ensure the data aligns with your decision-making needs.
Matrix Flexibility
Multi-Element Speed
High Sensitivity
Why Use ICP-OES?
ICP‑OES is an excellent choice for quick, economical trace elemental analysis, supporting projects that demand accurate multi‑element quantification without the complexity of higher‑sensitivity techniques.
It is ideally suited for trace metal detection, elemental impurity analysis, leaching studies, and stoichiometry determination, enabling reliable insights across research, manufacturing, and quality control workflows.
With excellent sensitivity, broad linear range, and robust matrix tolerance, ICP‑OES delivers fast, defensible results even for complex sample types, making it a practical and efficient tool for most elemental testing requirements.
Analytical Breadth
Application Versatility
Workflow Integration
How ICP-OES Works
ICP-OES translates emitted light into quantitative elemental data. A liquid or digested solid sample is nebulized into a fine aerosol and then injected into a high-temperature argon plasma.
Inside the plasma, atoms emit photons as electrons return to the ground state. A detector captures these emissions, correlating wavelength intensity to elemental abundance.
Covalent’s platform is engineered to deliver accurate elemental profiles from even difficult sample matrices.
Equipment Used for ICP-OES
ThermoFisher Scientific iCAP-7400 Duo
- Broad elemental coverage: Measures wavelengths from 166 to 847 nm for flexible multi-element analysis.
- Stable detection: CID86 technology provides precise, repeatable measurements across wide concentration ranges.
- Controlled optics: A temperature-stabilized polychromator maintains consistent resolution and accuracy.
- Flexible workflows: Supports diverse sample matrices, autosampling, and microwave digestion.
- High-throughput performance: Enables reliable trace metals analysis and rapid processing of large sample batches.
Key Differentiators
ICP-OES is built for rapid, high-precision multi-element analysis. Our configuration supports both exploratory research and routine QA programs.
ICP‑OES detects trace and bulk elemental concentrations (ppb to ppm), enabling multi‑element profiling in complex mixtures and revealing impurities, leachates, and major constituents. Compatible with aqueous solutions, digested solids, alloys, polymers, oils, ceramics, biomaterials, pharmaceuticals, and minerals, ICP‑OES adapts to nearly any plasma‑ready matrix.
ICP-OES vs ICP-MS
Both techniques rely on plasma excitation but diverge in detection mode.
| Parameter | ICP-OES | ICP-MS |
|---|---|---|
| Detection | Optical emission spectroscopy | Mass spectrometry |
| Sensitivity | Moderate (ppb) | High (ppt) |
| Isotopic Analysis | Not available | Available |
| Matrix Tolerance | High | Lower |
| Throughput | High (faster setup and analysis) | Slower due to prep and interference control |
When to Choose ICP-OES:
- You need fast, multi-element screening.
- Sample prep time is limited.
- Matrix interference is a concern.
- Isotopic or ultra-trace analysis is not required.
Get in touch with our experts to determine the best-fit technique for your matrix, detection thresholds, and reporting requirements.
Strengths
- Detects elements at ppb concentrations.
- Simultaneous multi-element scans.
- Linear dynamic range across orders of magnitude.
- Minimal sample mass required.
- Compatible with aggressive digestion workflows.
Limitations
- Requires samples in solution form.
- Cannot resolve isotopes or molecular structures.
- Surface and depth profiling are not supported.
- Susceptible to matrix effects if not calibrated correctly.
Covalent addresses these challenges through matrix-matched standards, validated digestion workflows, and QA-verified calibration.
Example Outputs
The example below highlights how ICP‑OES delivers precise, repeatable results when quantifying Platinum Group Metals (PGMs) such as Au, Pd, Pt, Rh, and Ru. These elements are critical in advanced technologies and manufacturing, and accurate measurement is essential to ensure quality and performance.
- Excellent agreement between replicate measurements across three aliquots.
- High precision, with results closely matching the expected reference values.
- Reliable quantification of precious metals, even at elevated concentrations.
Sample Requirements
ICP-OES can analyze liquids and aqueous extracts, as well as solid materials that can be converted into plasma-compatible solutions, including metals, ceramics, polymers, composites, complex bulk mixtures, and residues.
- Liquid samples and aqueous extracts can often be analyzed directly or after dilution.
- Solid samples must be digested or dissolved before analysis.
- Acid digestion, microwave digestion, or combustion may be required, depending on the sample composition.
- Samples must be compatible with the plasma and sample introduction system.
- Milligram-scale quantities are typically sufficient, although exact requirements depend on the material and analytical goals.
ICP-OES Applications by Industry
Semiconductor & Microelectronics
Monitor trace metals in wafers, resists, and components to protect device integrity.
Pharmaceutical / Biotech / Clinical Labs
Detect elemental impurities in APIs, excipients, and biologics for regulatory compliance.
Energy Storage & Power Generation
Analyze electrolytes, electrodes, and degradation products in batteries and fuel cells.
Environmental Monitoring & Compliance
Measure trace metals in water, soils, and effluents to meet safety standards.
Food / Agriculture / Nutrition Science
Profile nutrients and contaminants in consumables, fertilizers, and animal feeds.
Geology / Mining / Metallurgy
Characterize ores, validate alloys, and track elemental composition during extraction and refining.
Techniques That Complement ICP-OES
Why Choose Covalent for Your ICP-OES Needs?
Covalent delivers rigorous, high-throughput ICP-OES analysis tailored to each sample’s chemistry and project goals. Our workflows combine microwave digestion, matrix-matched calibration, and controlled combustion with the speed and sensitivity of the iCAP 7400. By aligning reporting thresholds with your compliance, production, and development requirements, we provide accurate, actionable data that supports confident decisions.