my country divides reference materials into primary and secondary, and they all meet the definition of certified reference materials. The primary standard substance meets the following conditions:
Use the absolute measurement method or two or more accurate and reliable methods with different principles to determine the value. If there is only one method for determining the value, use multiple laboratories to determine the value with the same accurate and reliable method; @Accuracy has domestic The highest level, the uniformity is within the accuracy range;
Stability of more than one year, or reach the professional level of similar international reference materials;
The packaging form meets the requirements of the standard substance technical specification.
Secondary standard substances meet the following conditions:
Use the method of comparative measurement with the primary standard substance or the method of determining the value of the primary standard substance to determine the value;
The accuracy and uniformity have not reached the level of primary standard materials, but can meet the needs of general measurement;
The stability is more than half a year, or it can meet the needs of actual emphasis; @The packaging form meets the requirements of the standard substance technical specification.
Reference material number
The first two digits of the number are the category number of the standard substance. The third digit is the subclass number of the standard substance, and the last two digits are the sequence number. The production batch number is expressed in English lowercase letters. Ranked last in the standard substance number.
The number of the secondary standard substance is the front part of the code name "GBW" of the secondary standard substance. The first two digits of the number are the category number of the standard substance, and the last four digits are the serial number. Indicates that it is the last digit in the serial number.
At present, many developed countries are investing in the research and development of reference materials in a planned and step-by-step manner. In contrast, there is a certain gap in my country, mainly due to the lack of overall systemicity, planning and foresight in the development of standard materials. As a result, although the number of standard materials in my country is large, the varieties are incomplete, the categories are lacking, and the structure is unreasonable. The variety of standard materials in my country is mainly concentrated in the fields of iron and steel, geology and minerals, building materials, etc., while there is a large shortage of standard materials in some important development fields such as clinical testing, bioengineering, public safety, environmental protection, microelectronics and new materials, and relevant standards The development of substances is relatively lagging behind, making the detection of many products impossible. Relevant professionals pointed out that our country should focus on the research on the development planning of reference materials. In the future, CHINA will carry out research on emerging fields such as bioengineering, biochemistry/clinical, trace and ultra-trace standard substances; through in-depth and comprehensive research, the preparation technology and stability assurance technology of various standard substances will be solved. Research the problems existing in the practical application of standard materials in calibrating instruments, evaluating measurement methods and monitoring the quality of products in progress, and propose methods to solve problems and correct use methods. Not only make the standard material cover all measurement fields in terms of variety, but also strive to gradually reach and maintain the international professional level
