The oxygen escapes and the anhydrides, reacting with water, re-form nitric and sulphuric acids.
2
In this work we tested 12 commercially available anhydrides, selected based on their safety and hydrophobicity.
3
They also lay stress upon the superior stability of the nitrates of the anhydrides, especially of the ketoses.
4
Sulphur is objectionable in acetylene because it is converted into sulphurous and sulphuric anhydrides, or their respective acids, as it passes through the flame.