What is the reference material?
reference materialIt is a measurement standard to ensure accurate value and value traceability. It is widely used in calibrating measuring instruments, evaluating measurement methods, and giving material characteristic values. It plays an important role in quality management, quality assurance, technical arbitration, etc. 6 definitions of reference materials for testing
1. Reference material: A material or substance that has one or more sufficiently uniform and well-defined characteristic values to calibrate equipment, evaluate, measure methods, or assign values to materials. A reference material is a measurement standard, each with a reference material certificate, with uncertainty for a given confidence level for each standard value.
2. First-class purity reference material: codenamed GBW, refers to the use of absolute measurement methods or other accurate and reliable methods to measure their characteristic values, and the measurement accuracy reaches the highest level at home and abroad. It is mainly used for research and evaluation. Standard methods 3. Second-level purity reference material: code-named GBW (E), refers to the use of accurate and reliable methods, or directly compared with the first-level reference material. Also known as working reference material, it is mainly used to evaluate analytical methods and quality assurance in the same laboratory or between different laboratories.
4. Reference material certificate: It is a technical document to prove the standard value and accuracy of the reference material, introduce the reference material, and also a quality assurance certificate to the user, which is provided to the user along with the reference material. There is a "CMC" fixed design format logo on the reference material certificate and label.
5. Reference reagent: It is a reference material used to calibrate the concentration of standard solutions for volumetric analysis and the positioning of pH meters, and the purity is higher than excellent purity. It is divided into working reference reagents and first reference reagents. The reference reagents implement mandatory standards, but the first reference reagents are sent and determined by the metrology department.
6. Volume working reference reagent: It is used as a reference for quantity transfer to calibrate the concentration of standard titration solutions.
The role of reference materials
(1) Save and transfer characteristic values and establish measurement traceability
The reference material is a measurement standard with good accuracy, uniformity and stability of the characteristic quantity. It has the function of maintaining the characteristic value in time and transferring the value in space. By using the reference material, the actual measurement results can be traceable.
(2) Ensure the consistency and comparability of measurement results
By calibrating the measuring instruments and evaluating the measurement process, the measurement results are traced back to the national unit system (SI) by the reference material to ensure the consistency and comparability of the measurement results, so as to achieve the uniformity of the magnitude.
(3) Research and evaluation of measurement methods
Reference materials can be used as substances with known characteristic values to study and evaluate methods for measuring these components or characteristics, so as to judge the accuracy and reproducibility of the method, and to evaluate the adaptability of the detection method in specific occasions by verifying and improving the accuracy of the measurement method, so as to promote the development of testing technology.
(4) Establish the quality assurance of the measurement system
Testing institutions use standard materials for quality control to achieve quality assurance, which is a good way to ensure that testing data is accurate, reliable, and comparable.
