Sure. The EPA has set the limit at 2 ppm for barium. A read of this site --presumably done by people who have the qualification you seem to want--will answer the question about barium. There are articles about amounts more than 2 ppm being sprayed, and if you google that, I expect you'll be of the opinion that the newspapers are in on it, too. Amounts four times greater than 2 ppm having been measured.

The aluminum oxide will have to await another post. However, the whole tone of your posts indicates taht you don't rally give a shit about facts, because you're mind is made up already.