How are CRMs Certified? From Real-World Recycling to Certified Reference Materials

In this article we explore:

• How real-world recycling materials such as black mass and spent auto catalysts are processed and homogenized before certification
• Why matrix composition can make or break analytical accuracy in complex recycled materials
• How homogeneity testing and multi-lab validation establish reliable certified values
• What ISO accreditations mean in practical terms for traceability and audit compliance
• How CRMs reduce risk and protect commercial value in recycling streams
• Why matrix-matched CRMs enable more accurate recovery calculations, process optimization, and confident financial decision
  
  

Why does material certification matter in the circular economy?

Understanding how Certified Reference Materials (CRMs) are produced is essential for laboratories working with black mass, spent automotive catalysts, and other critical mineral streams. Certification isn’t a paperwork exercise, it’s a structured, time-intensive scientific process designed to ensure analytical results are accurate, traceable, reproducible, and defensible.

In lithium-ion battery recycling and precious metal recovery, numbers have consequences. When recovering lithium, cobalt, nickel, platinum, palladium, rhodium, or rare earth elements, even a small variation in results can affect the assessment of how much material is present—and in turn, the value assigned to it.

Recyclers need to be confident that the data guiding their processes and decision-making are correct, testing labs need accurate results, and customers need reference materials they can rely on.

That's where matrix-matched CRMs come in. But how are they made?

How are recycling materials prepared for certification as CRMs?  

Matrix-matched CRMs begin with real material. In recycling applications, this might include:

• Black mass from lithium-ion battery processing
• Spent automotive catalysts containing platinum group metals
• Critical mineral concentrates from recycling or recovery operations

But these materials are inherently heterogenous. The “matrix” refers to everything in the sample—not just the analyte of interest. And that matrix strongly influences how the material behaves during digestion, fusion, ICP analysis, or XRF measurement.

Take a catalytic converter: Precious metals such as platinum, palladium, and rhodium are dispersed across a ceramic substrate, surrounding which are alumina, silica, trace contaminants, and minor concentrations of other elements. In black mass, lithium, nickel, manganese, cobalt, graphite, copper, and aluminum are mixed in varying proportions, depending on battery chemistry and the feedstock entering the recycling process.

A calibration standard that doesn’t reflect the same matrix as the sample introduces avoidable analytical risk, so the first challenge in certification is to make something that's inherently variable behave consistently. This is why a consistent, effective homogenization process is so important.

Homogenization: Turning complexity into consistency

Homogenization must result in consistent elemental distribution throughout the entire batch. Before certification can begin, the material must be processed to ensure demonstrable uniformity.

This involves:

• Crushing and grinding to a controlled fine particle size
• Thorough blending to ensure consistent elemental distribution
• Packaging under controlled conditions

Homogeneity testing then takes samples from different parts of the batch, analyzing key elements to confirm consistency. Without this step, two jars of CRM from the same batch could yield different analytical results—which would defeat the purpose of a reference material.

For complex matrices, consistent composition is essential. Fine particle size improves reproducibility and reduces sampling error, especially when high-value elements are present at low concentrations. In commercial terms, greater homogeneity means tighter precision and fewer costly re-tests.

Multi-laboratory, multi-technique certification  

Once homogenization is confirmed, certification begins. The use of multiple laboratories, independent data sets, and various analytical techniques helps identify outliers and methodological bias.

The objective is to establish a value that's reliable, reproducible, and traceable, ensuring confidence for end users. Evaluation of the data establishes a certified value that takes into consideration the inherent variation in homogeneity, individual measurements, and inter-laboratory results.

Under AnalytiChem’s ISO 17034 accreditation, the material is sent to multiple independent, accredited laboratories for analysis. Each lab analyzes the material using appropriate techniques, which may include:

• ICP-OES or ICP-MS following acid digestion
• Fire assay with ICP finish
• XRF (loose powder, pressed pellet, or fused bead)
• Other validated elemental analysis methods

Multiple factors influence the process: Different acid digestions dissolve certain minerals more efficiently than others, ICP may experience spectral interferences, and XRF results vary depending on sample preparation. Even within one technique, results can shift slightly depending on method parameters. It’s these variables that underpin the need for multiple analyses.

One certified value—why does it matter?  

Some approaches to reference material certification provide technique-specific values—for example, one value for aqua regia digestion and another for four-acid digestion. That model works well in tightly defined workflows such as mining and exploration, but in emerging industries such as battery recycling, labs might use evolving or hybrid analytical techniques.

A consolidated certified value per analyte provides operational clarity. Regardless of whether the lab uses ICP, XRF, or another analytical technique, results should fall within the certified range.

This approach minimizes confusion and reduces technique bias—particularly for labs establishing new testing protocols. It also reduces the risk of selecting the “wrong” value and misinterpreting performance data.

Full matrix characterization: Seeing the whole picture  

Many legacy CRMs for spent automotive catalysts certify only platinum, palladium, and rhodium. Yet the matrix contains much more: alumina, silica, titanium, trace metals, and other minor components. These additional components can influence digestion behavior and analytical response, so failure to certify them limits CRMs’ scope.

Certifying as many elements as possible—major, minor, and trace—allows modern CRM programs to provide more precise analytical performance, increasing their effectiveness and value. For high-value materials, even small inaccuracies can affect yield calculations and commercial returns.

The greater performance of modern CRMs allows laboratories to do several things:

• Identify spectral overlaps in the analysis
• Detect incomplete sample digestion
• Recognize the impact of mineralogical effects
• Validate full workflow recovery

Full-matrix certification reduces blind spots and strengthens decision-making throughout the recycling workflow—from feedstock assessment to final metal recovery.

Accreditation and traceability: What do auditors ask?  

During audits, two questions frequently arise:

• Is the reference material produced under ISO 17034?
• What's it traceable to?

ISO 17034 accreditation governs the production of Certified Reference Materials. Laboratories operating under ISO 17025 are required to use traceable reference materials wherever possible.

Traceability often links back to National Measurement Institutes (NMIs) such as NIST, whose Standard Reference Materials (SRMs) are considered primary benchmarks. These are often expensive, and may have limited availability.

ISO 17034-accredited CRM producers, such as AnalytiChem, provide materials traceable to higher-order standards, offering labs a practical, cost-effective solution for routine quality control and trending. This enables daily QC monitoring without relying exclusively on scarce or high-cost primary SRMs.

For recycling environments—where margins matter—this balance between rigor and practicality is important.

Why do matrix-matched CRMs matter for black mass and auto catalysts?  

Labs that don’t have a matrix-matched CRM may calibrate instruments using single-element ICP standards, but while suitable for calibration, these products are unable to replicate the complex matrix behavior of real recycled material.

Matrix effects can suppress or enhance signal response—and without a true reference point, inaccuracies could go unnoticed, potentially distorting recovery calculations or material valuation.

For emerging matrices such as black mass, certified reference materials are very limited. This is because such matrices are complex, containing many elements, and producing a reliable, detailed matrix-matched CRM is both challenging and costly. But without them, labs are limited in their scope. AnalytiChem’s Black Mass matrix-matched, ISO 17034 accredited CRMs are high-quality products that give users confidence in their results.

A matrix-matched CRM like Black Mass allows laboratories to:

• Validate instrument calibration
• Confirm digestion completeness
• Detect method bias
• Monitor recovery efficiency
• Benchmark analytical performance over time

For lithium-ion battery recyclers, auto catalyst processors, and commercial testing labs, the resulting confidence supports better process control, stronger client reporting, and more defensible commercial decisions. This is where CRMs such as AnalytiChem’s Black Mass deliver every time.

How does CRM certification support value in circular supply chains?  

Certifying a material isn't a single measurement: it's a complex, structured process that involves real-world sourcing, rigorous homogenization, homogeneity testing, multi-lab validation, statistical evaluation, and documented traceability and uncertainty in order to deliver reliable results.

In circular economy industries, the value of recycled materials re-entering global supply chains is dependent on analytical accuracy. Certified Reference Materials provide the independent benchmark that makes that accuracy credible. Quality CRMs help protect margin, support compliance, and strengthen trust between recyclers, refiners, and downstream buyers.

At AnalytiChem, our ISO 17034-certified Black Mass CRMs, spent automotive catalyst CRMs, and critical mineral CRMs are premium products produced from real recycled materials, certified across a wide range of elements, and designed to support modern analytical workflows—because in high-value recycling, reliable data is the bedrock of efficiency and confident business decisions.

To discuss which CRM best supports your lithium-ion battery, auto catalyst, or critical mineral workflow, contact the AnalytiChem team, we’re ready to help.