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Ideally, as a scientific consultant (giving free advice only) once you get on the toxic site where yours is a drop in the bucket by comparison, you will be able to identify recycling opportunities worth way more to them than the cost of properly disposing of your paltry amount by the established registered professionals, according to the specific arcane regulations in place which you value their expertise for. Otherwise if you need to truly discard excess (even prime chemical assets then become a liability) you need to not only usually pay, but bump your paperwork and liability up from merely dangerous goods to full waste documentation requirements. Hazardous material does not become hazardous waste if you can legitimately sell/ship it off the site as a worthwhile product instead.
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Some better opportunities can even be with material or waste handlers who have no lab at all.
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Not necessarily an environmental lab where they actually test waste, better an industrial lab that tests material. Partner with a hazardous material testing lab, or another type of operation where they use lots of hazardous material similar to yours and end up turning a bit of it into waste themselves.
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