Re: [APD] Removes "heavy metals"?

[António Vitor <antonio_vitor at sapo.pt>]

> (all toxic heavy metals)."?
>
> It's mainly these toxic heavy metals that are removed/neutralized?

that depends on the afinity of those compounds ...(I named them chelators,
don't know if I am right).

My guess is that they use EDTA (the same stuff present on fertilizers), it's
cheap, even present on hair conditioneres and shampoos.

Someone know what are those afinities (EDTA) with common metals?

Regards from Portugal (in europe)!
António Vitor
----- Original Message ----- 
From: "Laith Arif" <laith at swissonline_ch>
To: "'aquatic plants digest'" <aquatic-plants at actwin_com>
Sent: Monday, August 16, 2004 11:20 PM
Subject: RE: [APD] Removes "heavy metals"?


> Ok, thanks for the info and the links.
>
> So Greg Morin is correct when he says "This should not be an issue unless
> you are really wanting to keep high levels of lead, mercury and cadmium
;-)
> (all toxic heavy metals)."?
>
> It's mainly these toxic heavy metals that are removed/neutralized?
>
> The reason I asked in the first place was just wondering whether at every
> water change and the addition of the conditioner, I was basically starting
> out with water "bare" of all metals and needed to take this into account
> when dosing ferts and traces.
>
> Thanks for the input.
>
> Regards,
>
> Laith
>
>
> -----Original Message-----
> From: S. Hieber [mailto:shieber at yahoo_com]
> Sent: 16 August 2004 11:36
> To: aquatic plants digest
> Subject: Re: [APD] Removes "heavy metals"?
>
> None of hte elements in the aquariumare, say, converted to
> energy -- if they are there before the conditioner is
> added, they are there afterwards. It's a matter of the
> chemical or ionic bonds and what compounds are in the tank.
>
> Conditioners that "remove" chloramine break up the compound
> into constituents that can then remain separate or
> recombine with other elements to form new compounds.
> Something that breaks up chloramine could leave your tank
> with a sudden dose of ammonia.
>
> Some conditioners bind the elements and bind some so-called
> heavy metals. The metal elements are not gone, but tied up
> in a compound that is presumably less risky to fish or
> plants. Some conditioners, like SeaChem Prime break up
> chloramine and then "grab" the nitrogen in a new compound
> less harmful to fish but still available to plants as a
> nutrient.
>
> There is an order of "preference" for what metals a
> conditioner will grab.
>
> There are lots of posts in the archives. Here are a few:
>
> http://fins.actwin.com/aquatic-plants/month.200102/msg00171.html
>
> http://fins.actwin.com/aquatic-plants/month.200302/msg00030.html
>
> http://fins.actwin.com/aquatic-plants/month.200303/msg00029.html
>
> It matters what conditioner you use. If you have
> chloramines, you want something thatdoesn't leave you with
> a sudden dose of ammonia. As for trace metals, I don't
> think it's an issue. If there is nothing else to bind, some
> iron might be bound but the amount is small and a worthy
> trade-off for gaurding against chlorine, chloramine, and
> heavy metals. And the bound iron can still be gotten by the
> plants eventually.
>
> Good luck, good fun,
> Scott H.
> --- Laith Arif <laith at swissonline_ch> wrote:
>
> >
> > I'm curious to know what exactly my water conditioner
> > (JBL Biotopol) means
> > by "removes heavy metals"... Does anyone know?
> >
> > Just wondering if besides removing chlorine and
> > chloramine it's also
> > removing useful plant nutrients (micro and/or macro).
>
>
> =====
> Want to get dirty but stay clean?
>
> Diana Walstad, author of _Ecology of the Planted Aquarium_ will discuss
soil
> supplemented aquarium substrates at the 2004 AGA Convention.
>
> Convention Details/Registration at aquatic-gardeners.org & gwapa.org
>
>
> _______________________________________________
> Aquatic-Plants mailing list
> Aquatic-Plants at actwin_com
> http://www.actwin.com/mailman/listinfo.cgi/aquatic-plants
>

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