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Re: gEDA-user: Disposing of Etch Solution

Yes, it's very easy to make H2O2 decompose.  Activated carbon does it
very quickly, but charcoal works too.  Just don't use charcoal
briquettes imbued with lighter fluid!.  And if your sink is getting
damaged, I would guess that the problem is too much base, not too much
H2O2.  Strong bases can etch stainless steel.

And yes DJ is correct that the copper precipitate would be hazardous
waste.  When I first replied to Rob, I thought that he meant "surplus"
solution, not "used" solution.

On Thu, Jan 20, 2011 at 10:19 AM, Mike Bushroe <mbushroe@xxxxxxxxx> wrote:
>     I have excess muratic acid/hydrogen per oxcide etch solution after
>     making a
>     board.  What is an acceptable way to dispose of it?
>     The hydrogen peroxide
>     is easy to neutralize; just put a piece of charcoal in the bottle
>     and
>     it should decompose.  First pour water into a container, then
>     mix in a calculated amount of base, then slowly pour in the acid.  I
>     don't know the relevant environmental regs, but I'm sure that at pH
>     5-9 those chemicals should be safe for any sewer.
>   I had not heard about using charcoal to neutralize the H2O2, I will try
>   that int he future. When I have dumped old muriatic (hydrochloric)
>   acid/hydrogen peroxide, I first sprinkle baking soda or pool soda ash
>   in until it stops foaming, then pour down the sink and rinse well.
>   However, this tarnishes the stainless steel sink, so obviously I have
>   not yet fully neutralized it. Next time I will start with the charcoal.
>   Mike
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