Accelerated Degradation Experiment
Conditions
Procedure A1: |
1 day exposure at 50 °C and 100% relative humidity. |
Procedure A2: |
10 days exposure at 50 °C and 100% relative humidity. |
Procedure A3: |
17 days exposure at 50 °C and 100% relative humidity. |
Procedure B: |
30 days exposure at 50 °C and 100% relative humidity followed by 2 days at 70 °C and 100% relative humidity. |
Appearance of the substance
The substance, originally in the form of a white, crystalline powder, changes after procedures A and B into a colourless liquid.
Gain of moisture
After procedure A1: |
5% |
After procedure A2: |
40% |
After procedure A3: |
65% |
After procedure B: |
70% |
Titrimetric determination
Dissolve 0.1 g of each of the samples subjected to procedures A2, A3 and B in 20 ml of water. Add 5 ml of formaldehyde previously neutralized against phenolphthalein, and titrate with 0.1 N sodium hydroxide using the same indicator.
The reference substance of ammonium chloride contains 98% of NH4Cl.
After procedure A2: |
60% |
After procedure A3: |
35% |
After procedure B: |
30% |
Conclusion
Ammonium chloride is very hygroscopic and is subject to fast decomposition under accelerated degradation conditions.
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