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Ash determination, also known as ignition residue inspection method, is a method to check for inorganic impurities in medicines
1.
Ash determination is divided into total ash determination and acid-insoluble ash determination
2.
(1) Determination of total ash
1.
2.
3.
4.
5.
(2) Determination of acid-insoluble ash
1.
2.
3.
Three, matters needing attention
(1) Carbonization operation
It should be carried out in a fume hood, and the test product must be put into a high-temperature furnace, and it must be completely carbonized
(2) Pay attention when carbonizing
1.
2.
(3) Encoding mark
1.
2.
Attention
(1) Turn on the desiccator: note that negative pressure is easy to form in the crucible, and the desiccator should be turned on carefully to avoid blowing away the light residue in the crucible
.
(2) Steps: The steps of acid dissolution, water washing and filtration in the determination of acid-insoluble ash have an impact on the measurement results.
Care should be taken to avoid ash loss
.
Four, calculation
