Regulations on the storage and use of reference materials:
1. Standard substances should be stored separately with other chemical reagents, and the storage conditions should meet the storage requirements of chemical reagents.
2. Instruments for taking and holding certified reference materials should be scrubbed repeatedly, then washed three times with distilled water and dried in a dustproof place.
3. Before operation, the operator should dust his head and clothes and wash his hands.
4. Date should be indicated when starting, and after taking out the reagent bottle (or weighing vessel) when weighing, it shall not be returned to the bottle.
5. When the reference material needs to be pretreated, it should be treated in strict accordance with the provisions of the material.
6. Standard substances must be labeled in weighers, and unused standard substances should be stored in dry environment.
Certified reference materials shall not be transferred to other uses.