[Histonet] Chromic Acid Disposal

[RAY KOELLING]

I agree with all these chemical means of disposal or management of wastes and toxic compounds.  But hope anyone, as has been mentioned on many occasions by others, please check with your LOCAL waste/sewer/environmental/water entity.  Having worked a bit in Florida, California, Washington and Missouri, they don't always agree with one another.  And the reference, out of Singapore, is probably at odds with them too.

Not only that, but even within a state, county or city rules and regulations can differ from one side of a boundary line to the other.

Check locally or you may be suddenly stopped from doing something chemically or environmentally even with the best of your intentions.

Ray Koelling
lecturer, University of Washington School of Medicine
Spokane WWAMI site

> On April 15, 2019 at 8:34 AM Tyrone Genade via Histonet <histonet at lists.utsouthwestern.edu> wrote:
> 
> 
> Hello,
> 
> For the disposal of Chromic acid see
> https://www.chemistry.nus.edu.sg/PSSO/safety/Special%20Chemical%20Waste.htm
>  and
> https://study.com/academy/lesson/chromic-acid-solution-preparation-disposal-hazards.html
> (more
> detailed).
> 
> You can precipitate the chrome as Cr(III) and store this solid for waste
> disposal instead of liquid chromic acid. In the process the acid is
> neutralized and the supernatant (of sulfates, potassium and sodium ions)
> diluted and washed down the sink.
> 
> I hope that helps.
> 
> Tyrone
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