When choosing to purchase national reference materials
1. Characteristic quantity
First of all, we need to know.National reference materialThe level of the characteristic quantity must match the level of our daily measured samples.
2. Uncertainty
In general, the level of uncertainty associated with national reference materials needs to be within the limits of precision and accuracy in daily measurements.
3. Substrate
When the national standard material is used for method validation, quality control, and calibration of some measurement methods with serious matrix effects, the matrix should be close to the matrix of the daily measurement sample.
Step 4 Dosage
In addition, when selecting national reference materials, the dosage must be sufficient to meet the requirements of the entire experimental plan, including the preparation of samples as needed, because only in this way can we improve the success rate of the experiment.
5. Stability
Before purchasing, the validity period of the purchased batch of national standard materials should be confirmed to avoid expiration during use. It should be known that if it is an expired product, it will lose some of its original functions, which will greatly cause experimental errors.
