What Is Inductively Coupled Plasma Mass Spectrometry (ICP-MS)?
Inductively Coupled Plasma Mass Spectrometry, also known as ICP-MS, is an elemental and isotopic analysis method that uses a high-temperature radio-frequency plasma to ionize materials. These ions are then separated and quantified by a mass spectrometer, providing both concentration and isotopic information at ultra-trace levels.
ICP-MS is commonly used to measure trace metals in aqueous solutions, and can achieve sensitivities that can reach up to parts-per-quadrillion. This technique can also maintain linear responses across several orders of magnitude and deliver simultaneous multi-element detection.
Wide Material Range
Ultra-trace Detection
Isotopic Precision
Why Use ICP-MS?
ICP-MS is the go-to choice when the task demands the most precise elemental insights. It excels in trace and ultra-trace elemental analysis, resolving concentrations that other techniques find difficult to detect.
The technique is applied across a broad and critical range of applications, and scientists depend on it for trace metal detection, elemental impurity analysis, and isotopic ratio measurement. These measurements form the backbone of decision-making in research, production, and compliance testing.
Because of this versatility, ICP‑MS has become integral across industries. It protects purity in semiconductor workflows, verifies compliance in pharmaceutical development, supports biomedical research, and enables monitoring in environmental, regulatory, energy, and forensic settings.
At the lowest detectable levels, where precision is non‑negotiable, ICP‑MS delivers clarity.
Triple-Quadrupole ICP-MS
Laser Ablation Capability
Flexible Workflows
How ICP-MS Analysis Method Works
Any technique begins with sample preparation, and ICP-MS is no different. In ICP-MS, the solid samples are digested, often with the help of acid, and the liquids are diluted. The prepared sample is then pumped through a nebulizer, which sprays it into a fine mist.
The mist is then swept into an argon plasma (typically operating at thousands of degrees Celsius). Rapidly, the plasma dries, decomposes the sample, and ionizes the constituent elements, forming +1 ions. These ions are directed through a sampling interface toward the mass analyzer. In a quadrupole system, they are separated by their mass-to-charge ratio (m/z) and counted by an electron multiplier.
At Covalent, this workflow lets us quantify elements across wide concentration ranges and deliver validated, robust reports for regulated and industrial applications.
Equipment Used for ICP-MS
At Covalent, we pair the Thermo Scientific iCAP TQ ICP‑MS with the Teledyne Photon Machines IRIDIA Laser Ablation system to cover both traditional liquid workflows and advanced solid‑sample analysis without compromise.
Thermo Scientific iCAP TQ ICP‑MS
- Triple‑quadrupole interference removal: TQ technology with a Collision/Reaction Cell to strip away complex matrix interferences, enabling confident sub‑ppt elemental quantification.
- High sensitivity with routine usability: Provides the lowest detection limits in Thermo’s benchtop ICP‑MS line while still supporting simple method development through Qtegra™ ISDS software and Reaction Finder tools.
- Consistency at scale: Engineered for uptime and repeatability, minimizing downtime and ensuring consistent, accurate results even over large sample batches.
- Flexible coupling with advanced sampling devices: Compatible with automation, chromatography, and laser ablation, expanding analysis modes beyond solution nebulization.
- Direct solid analysis with IRIDIA laser ablation: Fast washout (<1 ms), homogeneous energy delivery, and variable spot sizes allow high‑resolution elemental mapping and depth profiling of solid materials without full digestion.
PerkinElmer NexION® 5000
- Industry-first four-quadrupole design: Full-length Q0+Q1+Universal Cell+Q3 with <0.7 amu resolution for interference removal beyond triple-quad.
- Sub-ppt detection limits: BECs <1 ppt even in hot plasma for ppq-level sensitivity in semiconductor, biomonitoring, and advanced materials.
- Universal Cell with dynamic bandpass tuning: Reactive and collision gas modes for precise elimination of complex polyatomic interferences.
- Maintenance-free plasma system: 34 MHz LumiCoil™ RF generator + OmniRing™ Triple Cone Interface for unmatched matrix tolerance and long-term stability.
Key differentiators
Strengths
- Exceptional Sensitivity.
- Isotopic Discrimination.
- Wide Dynamic Range.
- Material Compatibility.
- Spatial Resolution and Depth Profiling.
- Flexible Workflows.
Limitations
- Most samples need conversion into a solution (excluding laser ablation); prep can be difficult depending on element solubility and stability.
- Accuracy requires calibration with matrix-matched standards.
- Isotopic measurements can be affected by polyatomic interferences.
- Limited to elemental analysis; provides no molecular or bonding information.
- Surface specificity is limited; depth profiling only possible with laser ablation.
- Technique depends on careful sample prep and interference management.
Example Outputs
Each ICP-MS run produces spectra and calibration curves that highlight both elements detected and their concentrations (as shown below). However, this data can be presented in multiple forms depending on the analysis:
At Covalent, we take this raw data and transform it into clear, actionable reports. Our clients receive:
- A list of all detected elements (and isotopes, if part of the study).
- Concentration values in ppb or ppm, corrected for digestion/dilution.
- Contextual interpretation from our experts, so the numbers are meaningful for your application or regulatory question.
Sample Requirements
When it comes to sample prep for ICP-MS, getting a gas, liquid, or solid sample ready for plasma ionization is the difference between accurate, actionable insights and inconclusive data.
- Acceptable forms: Gases, liquids, and solids can be measured once prepared for the plasma.
- Small sample quantities: Only a few milligrams are often enough when properly digested or diluted.
- Key properties: Volatility, solubility, and stability of the sample guide the preparation route.
- Special considerations: Organics, ceramics, and refractory materials require tailored digestion before analysis.
Covalent reviews every sample case by case, tailoring preparation so our clients can count on accurate, high‑sensitivity measurements.
ICP-MS Applications by Industry
Mining & Geology
ICP-MS detects platinum group metals like Pt, Pd, Rh, and Ir at sub-ppb levels in rocks and ores. This allows geologists to accurately assess ore value and plan extraction strategies that would be missed with less sensitive methods.
Oil & Petrochemical Refining
Refineries use ICP-MS to monitor trace elements such as Ni, V, and rare earth metals in fuel oils and petrochemical streams. Even minimal concentrations can impact catalyst lifetimes, process efficiency, and regulatory compliance, making precise detection critical.
Pharmaceuticals
ICP-MS ensures regulatory compliance (e.g., ICH Q3D) by measuring heavy metals like arsenic, cadmium, mercury, and lead well below required thresholds. This protects patient safety while supporting quality assurance in drug development.
Environmental Monitoring
Communities rely on ICP-MS for early detection of toxic elements, such as inorganic arsenic in groundwater. The technique distinguishes harmful inorganic forms from safe organic species, enabling rapid protective actions.
Semiconductor & Advanced Materials
Sub‑ppt detection of alkali and transition metals is essential for high-purity wafers and chemicals in chip fabrication. ICP-MS reveals trace contaminants that can reduce yields or damage device performance. Laser ablation capabilities further allow high-resolution mapping of solid samples and precise trace element analysis in challenging matrices.
Techniques That Complement ICP-MS
Shares a similar plasma-based measurement principle but uses optical emission spectroscopy instead of mass spectrometry. While ICP-OES is less sensitive than ICP-MS, it can handle slightly more complex matrices. ICP-MS provides the added advantage of isotopic analysis, which ICP-OES cannot.
Why Choose Covalent for Your ICP-MS Needs?
We use the combination of a triple-quadrupole ICP-MS, laser ablation interface, and microwave digestion capabilities, enabling us to adapt the method to a wider range of sample types and matrices than a standard lab setup. This ensures cleaner spectra, higher sensitivity, and confidence in results.
At Covalent, we ensure every sample is reviewed by experts who understand the preparation, matrix effects, and interferences that can make or break the ICP-MS measurements. This, in turn, helps us deliver reliable, accurate data, faster turnaround, and the technical clarity our clients need to move forward.