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Subject: Re: [Homebrew_PCBs] Re: Etching note

From: "Dale J. Chatham" <dale@...>
Date: 2010-06-14

On 06/14/2010 12:48 PM, Malcolm Parker-Lisberg wrote:
> An estimated 0.34 billion metric tons of copper currently exists in the ocean’s waters based on a concentration of 0.25 ug/L and a volume of 1.338 x 109 km3
> From MadSci Network, Internet site,
> “www.madsci.org�
>
> That's a lot of printed circuit boads
>
>

Copper is death to invertebrates in the ocean. Primarily, that means
coral, shrimp, crabs, ... While your concentrations are correct as an
average, close to the places where the effluent water (and I mean
processed and safe as far as sewage is considered) will have higher
concentrations.

The stuff really should be kept out of the ocean. Of course, if you live
near Louisiana, Mississippi, Alabama or Florida right now, it probably
doesn't reall matter all that much.

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