I would say you should use or test it once a week to ensure it is working properly in an active laboratory since it is a workplace with significant chemical hazards so it would give peace of mind to know on a quite regular basis that it can be relied on in case of an emergency like an eye flush for example.
The answer is electrons !. Hope it helps !! :)
This is known as polymerisation
Denitrification is part of the nitrogen cycle
