All right, I'll describe trivial in testing first.

Carbonate test, add sulfuric acid to a measured amount of borate solution and if it fizzes it fails the test but if it does not, it passes. That is my definition of a trivial and rather useless test, chemically.

Trivial in content now. Halides and heavy metals are critical in some applications and these are not addressed fully, just a few as seen from your post. As far as solids are concerned, a visual inspection is all they ask for. This is trivial both chemically and in content or intent for the purpose at hand, which is photography.