The method selected to measure dissolved oxygen should differentiate between diatomic oxygen and oxygen combined with other elements.

Ozone is not potable and reverts to diatomic oxygen, with a half-life of about 3 days in air room temperature (about 20 C).

This works well for both nearly ideal, atomic gases like helium and for molecular gases like diatomic oxygen.

The triatomic ozone molecule becomes diatomic molecular oxygen plus a free oxygen atom (see figure):

The diatomic oxygen is split into single atoms, which then recombine in triplets to form ozone.

Ozone cannot be stored and transported like other industrial gases (because it quickly decays into diatomic oxygen) and must therefore be produced on site.

For instance, oxygen exists as both diatomic oxygen (O) and ozone (O).

Unlike regular diatomic oxygen, ozone is a toxic material generally considered a pollutant.

Luciferase produces blue/green light through the oxidation of reduced flavin mononucleotide and a long-chain aldehyde by diatomic oxygen.

The energy given off is sufficient to form ozone from diatomic oxygen: