Overview
IEC TS 62607-6-20:2022 defines a standardized method to measure metallic impurity content in powders of graphene-based materials using inductively coupled plasma mass spectrometry (ICP‑MS). The Technical Specification covers sample pre‑treatment (digestion), ICP‑MS calibration and measurement, data analysis, uncertainty estimation and reporting. It applies to graphene powders including single- and few-layer graphene (2LG, 3LG, FLG), graphene oxide (GO) and reduced graphene oxide (rGO). The standard supports reproducible trace‑metal analysis critical for nanomanufacturing and microelectronics applications.
Key topics and requirements
- Scope and applicability: Measurement of metallic impurities in powder forms of graphene‑based materials for quality control and materials selection.
- Sample preparation: Optimized digestion and pre‑treatment procedures tailored to graphene powders to ensure complete recovery of trace metals.
- Instrumentation: Use of ICP‑MS with documented instrument description, internal standards and calibration practice.
- Calibration and quantitation: Standard stock solutions, calibration curves, whole‑element scanning and quantitative workflows for multi‑element detection.
- Quality checks: Method recovery and standard recovery procedures; identification and management of typical spectral interferences.
- Data analysis: Calculation of metal impurity contents from ICP‑MS signal intensities, reporting formats and content distribution analysis.
- Measurement uncertainty: Guidance on estimating uncertainty for reported impurity concentrations.
- Reporting: Required measurement metadata including sample identification, measurement conditions and analytical results.
- Informative annexes: Case studies (FLG, rGO), comparison of pre‑treatment methods, and ICP‑MS vs ICP‑OES result comparisons.
Practical applications and users
- Manufacturers of graphene‑based materials and inks who need to control metal impurity content for electrical performance.
- Downstream users in the microelectronics and display industries (conductive pastes, integrated circuits, high‑frequency electronics) selecting materials with defined trace‑metal specifications.
- Quality control and analytical laboratories performing routine or contract ICP‑MS testing of graphene powders.
- R&D teams optimizing synthesis routes and purification methods to reduce metal contaminants.
- Regulatory and standards bodies seeking harmonized test methods for nanomanufacturing.
Related standards
- IEC TS 62607 series - other parts address key control characteristics for nanomanufacturing.
- ISO/TS 13278 (carbon nanotubes) - analogous trace‑metal ICP methods for CNTs (not directly interchangeable with graphene powder methods).
Keywords: IEC TS 62607-6-20:2022, graphene-based material, metallic impurity content, ICP‑MS, inductively coupled plasma mass spectrometry, graphene powder, rGO, GO, FLG, nanomanufacturing, microelectronics.