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Just had a sample of the Eaton Fire ash that is in my driveway run on the department XRF. Is there titanium (new house paint)? Yup. Lead (old house paint)? You betcha. Heavy metals? Check. Treat that ash like it's toxic folks (because it is)

.1% strontium? where the heck does strontium come from?

Traces of strontium occur naturally in many Ca compounds, including from wood ash.

If I may add: Al, Si, Zr, Mg: Probably silicates from soil material Ca, K: Wood ash, maybe also soil material (silicates and carbonates) Ti: May be from soil, but also used in whitener in e.g. paint, sunscreen, toothpaste. The rest: maybe from soil, road dust,etc. but poss. also from burnt stuff.