Dear all,
Sorry for my english (i’m Italian). I’ve found this discussion really interesting. My doubt is that the discussion missed a fundamental point “TIME”. Most of the chemical you mention are present in all the building materials. Zinc and chromium are present in all metallic fence, organic component are in all colorant and paint. The main point is the amount of release and time. Consider using tyre probability destroy it millimeter each year and these materials go into the ground by rain water. My opinion is how inert is tyre and how many years need to release chemicals? Of course if you compare with natural wood, no game, but compared with painted wood or painted metal or other plastic probably is safer. I would try to see if there is some scientific paper on release profile over the time. The only proof o have is close to my house there are 2 large mass of garbage , one are tyre and the other are metal and plastic. The soil arround the tire are full of vegetables ariund the other the soil is dead. Of course is not science because I don’t know what the cumulus of garbage contain..
If I found some info i’ll Write here. Please do the same so we can create a good repository for many people that are using this solution in the Garden
Ciao
Marco
