What is Heavy Metal Elemental Impurity Analysis?

Heavy metal elemental impurity analysis is an analytical procedure used to determine the presence and concentration of toxic metallic elements in a given sample. It involves the precise detection of metals such as lead, cadmium, mercury, and arsenic, which can be harmful to human health and the environment even at trace levels.

Beyond ICH Q3D–driven elemental impurity studies in pharmaceuticals, Nikopharmad also offers heavy metals analysis across diverse matrices such as food, cosmetics, medical devices and environmental samples using the same ICP-MS, ICP-OES, AAS and XRF platforms.

Typical Heavy Metals Monitored

• Class 1 (most toxic, strictest limits): As, Cd, Hg, Pb
• Class 2A: Co, V, Ni
• Class 2B: Ag, Au, Pd, Pt, Rh, Ru, Se, Tl
• Class 3 (less toxic): Ba, Cr, Cu, Li, Mo, Sb, Sn

Analytical Methods Used

• ICP-MS (Inductively Coupled Plasma Mass Spectrometry) — ultra-trace sensitivity, multi-element capability
• ICP-OES (Optical Emission Spectroscopy) — mid-to-low ppb range
• AAS (Atomic Absorption Spectroscopy) — single-element analysis
• XRF (X-ray Fluorescence) — rapid screening, solid samples

 

 Heavy Metal Elemental Impurity Analysis Standards

Heavy Metal Elemental Impurity Analysis Procedure

Sample Preparation (Common Step for All Methods)

Regardless of the instrument, accurate heavy metal analysis begins with proper sample preparation:

Digestion: Most solid or viscous samples (pharmaceuticals, food, soil, cosmetics) are digested using acid

mixtures (e.g., nitric acid, hydrochloric acid, sometimes with hydrogen peroxide) in an open vessel hotplate or

microwave digestion system. This breaks down the matrix and converts metals into soluble ionic forms.

Dilution: The digested solution is diluted to an appropriate concentration in ultrapure water with trace-metal-grade acids to match the calibration matrix.

Filtration: Particulates are removed to avoid nebulizer clogging in ICP or AAS systems.

Calibration Standards: Prepared from certified reference materials (multi-element standards) at known concentrations for accurate quantitation.

 ICP-MS (Inductively Coupled Plasma – Mass Spectrometry)

The sample solution is nebulized into a fine aerosol, introduced into an argon plasma (~10,000 K) where atoms are ionized, and then separated/detected by mass spectrometry based on their mass-to-charge ratio (m/z).

Procedure:

Nebulization → liquid sample converted into aerosol.

Plasma Ionization → metals are atomized and ionized in the plasma.

Ion Extraction → ions enter the mass spectrometer through a series of cones.

Mass Filtering → quadrupole, time-of-flight, or sector field separates ions.

Detection → counts ions at each m/z, correlating to metal concentration.

Data Processing → calibration curve applied, concentrations calculated (often down to ppt levels).

Advantages: Ultra-trace detection (ppt–ppb), multi-element, isotopic analysis possible.

Limitation: More expensive, sensitive to high dissolved solids.

ICP-OES (Optical Emission Spectrometry)

The sample aerosol is introduced into an argon plasma where atoms are excited to higher energy states; as they relax, they emit light at element-specific wavelengths, which is measured.

Procedure:

Nebulization → aerosol generation.

Plasma Excitation → atoms emit light characteristic to each metal.

Spectral Dispersion → a diffraction grating disperses light into a spectrometer.

Detection → photomultiplier tubes or solid-state detectors measure intensity.

Quantification → calibration curves relate emission intensity to concentration.

Advantages: Good sensitivity (ppb range), multi-element, robust to higher solids than ICP-MS.

Limitation: Less sensitive than ICP-MS for ultra-trace work.

AAS (Atomic Absorption Spectroscopy)

Atoms in a flame or graphite furnace absorb light at specific wavelengths from a hollow cathode lamp. The amount of absorbed light is proportional to metal concentration.

Procedure:

Sample Introduction → solution aspirated into flame (flame AAS) or injected into a graphite tube (graphite furnace AAS).

Atomization → heat converts analytes to free atoms.

Light Source → hollow cathode lamp emits wavelength specific to the metal.

Absorption Measurement → decrease in light intensity is measured.

Quantification → calibration curve applied to absorption data.

Advantages: Good for single-element, low-cost, moderate sensitivity (ppb range in graphite furnace mode).

Limitation: Single-element at a time, slower for multi-element analysis.

XRF (X-ray Fluorescence Spectroscopy)

High-energy X-rays bombard the solid sample, ejecting inner-shell electrons. When outer-shell electrons fill the vacancy, element-specific fluorescent X-rays are emitted and detected.

Procedure:

Sample Preparation → solid pressed into pellets or measured directly (minimal prep).

Excitation → X-ray tube generates primary X-rays.

Fluorescence Emission → sample emits secondary X-rays characteristic of elements present.

Detection → energy-dispersive or wavelength-dispersive detectors measure emission spectra.

Quantification → compare peak intensities to calibration standards.

Advantages: Non-destructive, minimal preparation, suitable for solids and coatings.

Limitation: Higher detection limits (ppm), matrix effects can be significant.

 

Technique	Detection Limit	Multi-element Capability	State of Sample	Speed	Typical Use
ICP-MS	ppt–ppb	Yes	Liquid (digested solid)	Fast	Ultra-trace analysis, pharma, environment
ICP-OES	Low ppb	Yes	Liquid	Fast	Routine multi-element
AAS	ppb (GFAAS), ppm (Flame)	No	Liquid	Moderate	Targeted single-element
XRF	ppm	Yes	Solid	Very fast	Screening, in-situ

Nikopharmad Heavy Metal Analysis Laboratory

Accreditation and Global Recognition

At Nikopharmad, our Heavy Metal Elemental Impurity Analysis services are backed by ISO/IEC 17025 certification and ILAC accreditation, ensuring strict compliance with globally recognized standards for analytical quality and technical competence. These prestigious credentials confirm that our elemental impurity data meet the highest international regulatory requirements, fully accepted by health authorities and compliance agencies worldwide.

Technical Excellence and Validated Infrastructure

Our state-of-the-art analytical laboratory is equipped with advanced instrumentation, including Inductively Coupled Plasma Mass Spectrometry (ICP-MS), Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), and Graphite Furnace Atomic Absorption Spectroscopy (GFAAS). We adhere to validated methodologies such as ICH Q3D, USP <232>/<233>, and EP 2.4.20, ensuring reliable detection and quantification of elemental impurities.

Regulatory-Ready Reporting and Timely Results

In today’s regulatory-driven environment, speed and precision are critical. Nikopharmad ensures rapid turnaround of heavy metal analysis without sacrificing analytical integrity. Our streamlined workflows and robust quality assurance programs deliver full traceability of raw data, comprehensive statistical analysis, and submission-ready reports for FDA, EMA, and other international regulatory bodies. Our results are formatted to support regulatory submissions and audits, ensuring compliance with global pharmacopeial standards.

Confidentiality and Data Integrity

We recognize the sensitivity of your formulation and testing data. heavy metal test is conducted under strict confidentiality agreements and managed within 21 CFR Part 11-compliant electronic systems. Every analytical result is safeguarded with a complete audit trail, validated data handling, and secure storage protocols, ensuring full protection of your intellectual property from receipt to final reporting.

Competitive Pricing with Uncompromised Quality

Our elemental impurity analysis services are competitively priced to meet the needs of startups, SMEs, and multinational enterprises alike. We design cost-effective testing packages that support your regulatory strategy, enabling you to accelerate product approvals while maintaining uncompromising analytical accuracy, compliance, and data defensibility.

 To request testing or a complimentary consultation contact Nikopharmad

Partner with Nikopharmad for Heavy Metal analysis

By selecting Nikopharmad for your Heavy Metal Elemental Impurity Analysis, you gain a globally accredited partner dedicated to scientific precision, regulatory compliance, and client confidentiality. Whether you are assessing lead, cadmium, arsenic, mercury, or a broader panel of elemental impurities, our expertise ensures fast, reliable, and internationally recognized results—positioning your product for smooth market entry and regulatory success.