Even if some of the sulfate will be reduced to sulfide, making the barium soluble, the sulfide will be oxidized again by the air after some time, immobilizing any remaining barium.
The barium that might have leached will be precipitated by the carbon dioxide from the air into barium carbonate.
Any form of soluble barium left in the environment will end soon as either barium sulfate or barium carbonate, which are insoluble, thus non-poisonous.
Barium is one of the least dangerous metals with high atomic number. You have to do something really stupid and deliberate with it in order to be able to poison anyone.
The barium that might have leached will be precipitated by the carbon dioxide from the air into barium carbonate.
Any form of soluble barium left in the environment will end soon as either barium sulfate or barium carbonate, which are insoluble, thus non-poisonous.
Barium is one of the least dangerous metals with high atomic number. You have to do something really stupid and deliberate with it in order to be able to poison anyone.