Accelerated Degradation Experiment
Conditions
Procedure A: |
30 days exposure at 50 °C and 100% relative humidity. |
Procedure B: |
30 days exposure at 50 °C and 100% relative humidity followed by 4 days at 70 °C and 100% relative humidity. |
Appearance of the substance
The substance, originally in the form of a fine, yellow-orange powder, changes after procedure A into a brown coloured powder.
Gain of moisture
After procedure A: |
3% |
After procedure B: |
6% |
Chemical determination
Titration of the mercuric ion with thiocyanate in the presence of ferric ammonium sulfate.
After procedures A and B: rapid decomposition, reaching 90%.
Conclusion
Mercuric oxide yellow is subject to decomposition under accelerated degradation conditions.
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