GB/Z 139-2025Nanotechnologies - Guidance on the measurement of nanoparticle number concentration (English PDF)
纳米技术 纳米颗粒数量浓度测量指南
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 3, 2025
Implementation date
December 3, 2025
Scope
GB/Z 139-2025 is the English-translated version of 纳米技术 纳米颗粒数量浓度测量指南.
GB/Z 139-2025 is the Chinese national standard covering nanotechnologies, Guidance on the measurement of nanoparticle number concentration. It was issued on 3 December 2025 and has been in force since 3 December 2025, as a first edition.
The document is under the responsibility of the Chinese Academy of Sciences. This page is published from the official record of the 2025 edition; the clause text of a standard this recent is not yet in circulation, and the figures, limits and tables it contains are those of the document itself, delivered in full with the English translation.
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Document preview — GB/Z 139-2025
National Standard of the People's Republic of China
- ICS
- 07.120
- Classification
- G 30
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- [Preview only]
- 1 Scope
- 2 Normative References
- 2.1 Terms
- 3 Terms and Definitions
- 4 Overview
- 4.1 General requirements
- 5 Technical Requirements
- 6 Calibration conditions
- 6.1 Environmental conditions
- 6.2 Measurement standards and other equipment
- 7 Calibration items and calibration methods
- 7.1 Calibration Items
- 7.2 Calibration method
- 8 Expression of calibration results
- 9 Recalibration interval
1 Foreword
GB/Z 139-2025 was issued by State Administration for Market Regulation; Standardization Administration of the PRC on 3 December 2025 and took effect the same day.
The GB/Z prefix marks a guiding technical document.
The document runs to 40 pages in English translation.
2 Scope Preview
GB/Z 139-2025 falls under ICS 07.120, in the field of natural and applied sciences.
This catalogue holds 28 other GB/Z standards in that field.
In this catalogue, GB/Z standards carry edition years from 1999 to 2026.
3 About this standard
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
English translation: about 40 pages
4 Related standards
Standards on related subjects:
GB 55031-2022 — General Code for Civil Buildings
GB 55030-2022 — General code for waterproofing of building and municipal engineering
5 Classification and status
International classification (ICS): 07.120
Chinese Standard Classification (CCS): G 30
Prefix GB/Z: guiding technical document.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 40 pages — is available in the English PDF.
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