Solution that provides up to two stages can be used in place of a standard substance by standard enclosure with standard substance one stage which is preparation of high purity and qualified as a standard step one.
Prepared solution can be used as standard equipment by Standard exposure to the standard one-step preparation of high purity and is a feature of the standard one.
The solution prepared can be used as a calibration standard step two by standard measures of oxidized substances ฐานขั้น one prepared substance with high purity and qualified as the standard step one.