On Mon, Dec 7, 2009 at 6:21 AM, Piers Goodhew <piers@...> wrote:
> I've wondered about this, too, and I've read a few things "somewhere" - i.e.
> I can't actually swear they're true, but they seem to add up:
>
> Ammonium Persulphate as-is is a mild fertiliser without much toxicity. Once
> copper is dissolved in it, we get Copper Sulphate which is a little more
> toxic. This should be evaporated and disposed of in your local hazardous
> waste facility - you evaporate because at "non-hobby" quantities, you pay by
> weight. However, CuSO4 is also commonly used as a pool fungicide
> (algicide?), so folks with pools often just throw it in there - i.e. it's
> not that toxic to humans.
>
> Now, the following I do have evidence for:
>
> Looks like the original poster is in Australia, as I am. At least in NSW you
> can dispose of "hobby chemicals" for free on special days which rotate
> around the local councils:
>
> http://www.environment.nsw.gov.au/households/CleanoutGuide.htm
>
> When I eventually turn all of my jar of Ammonium Persulphate into blue salt,
> that's where I'll be heading, but it will be years!
>
> PG
>
>
> On Mon, Dec 7, 2009 at 1:34 PM, <tim.wade@...> wrote:
>
>>
>>
>> Read somewhere - can't find it now of course - that you should let it
>> evaporate so that you effectively end up with copper sulphate crystals
>> then place sealed bottle and put in the rubbish...
>>
>> From: Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>
>> [mailto:Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>]
>> On Behalf Of Stefan Trethan
>> Sent: Monday, 7 December 2009 1:11 AM
>>
>> To: Homebrew_PCBs@yahoogroups.com <Homebrew_PCBs%40yahoogroups.com>
>> Subject: Re: [Homebrew_PCBs] Ammonium Persulfate - poisonous?
>>
>>
>> On it's own it's Xn rating, no idea what it would be with the copper.
>> Anyway Xn is enough that you want to read the MSDS.
>>
>> <http://www.hillbrothers.com/msds/pdf/n/ammonium-persulfate.pdf>
>>
>> Which is not too bad, seems it's just barely Xn.
>>
>> Once you add the copper, you are not supposed to flush it down the
>> drain anyway, so it doesn't really matter if AP could be disposed of
>> that way. Bring it to your local waste disposal facility, in most
>> places around the world household hazardous waste can be brought in
>> free of charge, to discourage people dumping it illegally.
>>
>> ST
>>
>> On Sun, Dec 6, 2009 at 3:54 PM, Anthony Shipman <als@...<als%40iinet.net.au>
>> <mailto:als%40iinet.net.au <als%2540iinet.net.au>> > wrote:
>> > On Sun, 6 Dec 2009 06:45:22 am designer_craig wrote:
>> >> I am not sure if you mean Ammonium Peroxide or Ammonium Persulfate
>> but I
>> >> had some quantity of the latter sitting around for 15 years and it
>> all went
>> >> bad and would not etch anything when I tried to etch a board. Not
>> sure
>> >> what it decomposed to but I suspect it reverted to Ammonium Sulphate.
>> >>
>> >> Craig
>> >
>> > BTW how toxic is this stuff (Ammonium Persulfate). The container had
>> no
>> > warnings on it. I have some etchant with dissolved copper in it. Is it
>> > poisonous? What is the best way to dispose of it?
>> >
>> > --
>> > Anthony Shipman Mamas don't let your babies
>> > als@... <als%40iinet.net.au> <mailto:als%40iinet.net.au<als%2540iinet.net.au>>
>> grow
>>
>> up to be outsourced.
>> >
>> >
>> > ------------------------------------
>> >
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>> >
>> >
>> >
>> >
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>
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>
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