GB/T 42240-2022 in English

Interpretation of the Standard for Determination of Metal Impurities in Graphene Powders

1. Scope and Applicability of the Standard

This standard applies to the determination of metal impurities in graphene powders, mainly using inductively coupled plasma mass spectrometry (ICP-MS) technology. The method is also applicable to the detection of metal impurities in other carbon-based nanomaterials such as carbon nanotubes and carbon fibers.

2. Background of Standard Formulation

Graphene powders are widely used in new energy batteries, thermal management and other fields, but differences in their production processes lead to different metal impurity contents. In order to ensure product quality and application performance, it is urgent to establish a standardized detection method.

3. Detection Principle

ICP-MS technology achieves quantitative analysis of multiple metal impurities by atomizing, atomizing and ionizing the sample solution and then performing mass separation and detection. This method has the characteristics of high sensitivity and wide dynamic range.

4. Key technical requirements

Reagent selection: Nitric acid, hydrofluoric acid, etc. must be MOS grade or higher purity.

Instrument: Equipped with quadrupole or sector magnetic field ICP-MS, meeting the reference conditions in Appendix A.

5. Implementation Suggestions

To ensure detection accuracy, it is recommended to:

• Choose an appropriate sample treatment method (microwave digestion is preferred)
• Establish a multi-element standard calibration curve
• Regularly calibrate the instrument and monitor measurement uncertainty

6. Comparative analysis of standard frameworks

7. Conclusion

GB/T42240-2022 standard provides a scientific basis for the quality control of graphene powder and promotes the development of nanotechnology.