Good for you in seeking a way to properly dispose of the mercury.
You’ll have to check locally, but these agencies should give good
advice for the best way to handle Hg: State environmental agency -
hazardous material bureau, local health dept., county extension
If you have a college or university nearby, they may take your Hg,
as most have a collection program for broken scientific equipment
that uses Hg.
Thanks for being a responsible environmental steward!
Judy in Kansas… actually in Colorado for a visit and watching
Pike’s Peak grow whiter each day.