[Histonet] proper disposal of chemicals

[Hutton, Allison]

I have a fair amount of different chemicals that are expired and need to be disposed of.  I am looking for advice on how to properly dispose of the following chemicals beyond "in accordance with local, state, and federal guidelines":
*Gold Chloride 0.2% aq
*Schiff reagent
*Aniline Carbol Fuchsin
*Gomori Trichrome Stain
*Glycerol
*Iodine Powder
*Ammoniacal Silver Nitrate
*1N Sodium Hydroxide
Any advice would be greatly appreciated
I am located in PA
Thanks,
Allison