CRM、RM、SRM、ERM之间有什么区别？
标准物质（RM）是一组纯物质或基质材料的通用术语，用于校准、方法验证、建立计量可追溯性、方法开发和各种质量控制目的（能力测试、图表等）。如果参考材料满足许多要求（已证明的均匀性和稳定性，使用适当、描述良好和验证的方法对特性值进行表征），则可以在证书中总结该信息，从而成为经认证的参考材料（CRM）。
SRM®是美国国家标准与技术研究所（NIST）为其生产的认证参考材料注册的商标，代表标准参考材料。
任何ERM®都是一种具有欧洲共同体商标的CRM，由欧洲标准物质（ERM）合作伙伴生产，并符合严格的质量标准。
What is the difference between CRM, RM, SRM, ERM?/ CRM、RM、SRM、ERM之间有什么区别
Reference material (RM) is the generic term for a group of either pure substances or matrix materials, which are used for calibration, method validation, the establishment of metrological traceability, method development, and various quality control purposes (proficiency testing, charting, etc). If the reference material fulfils a number of requirements (proven homogeneity and stability, characterisation of the property values using suitable, well-described and validated methods) this information may be summed up in a certificate, thus being a certified reference material (CRM).
SRM® is a trademark registered by the US National Institute for Standards and Technology (NIST) for the certified reference materials they produce and stands for Standard Reference Material.
Any ERM® is a CRM carrying the trademark of the European Communities for CRMs produced by partners of the European Reference Material (ERM) co-operation and fulfilling stringent quality criteria.