Looks like there are kits in the 60-100$ range, a local college chemistry lab might also be able to do it, there may also be a simple test you can apply - sound

Looks like there are kits in the 60-100$ range, a local college chemistry lab might also be able to do it, there may also be a simple test you can apply - sounds like much more effort than what you put in acquiring, might be worthwhile to just cut it at a loss if you think it is a risk at all