http://www.inchem.org/documents/pims/chemical/pim495.htm
"IPCS INCHEM is a means of rapid access to internationally peer
reviewed information on chemicals commonly used throughout the world,
which may also occur as contaminants in the environment and food. It
consolidates information from a number of intergovernmental
organizations whose goal it is to assist in the sound management of
chemicals.
Sodium hypochlorite
Composition/Purity: Usually sold in solutions
containing 5 to 15% sodium hypochlorite in water,
with
0.25 to 0.35% free alkali (usually NaOH) and 0.5 to
1.5% NaCl. Solutions of up to 40% sodium
hypochlorite
in water are available. Solid sodium hypochlorite
(NaOCl.5H2O) is not commercially used."
All data I could find on the web discussed as liquid sodium
hypochlorite the water solution used as bleach, not the pure material.
And I found nothing that indicated that commercially available bleach,
including 'Purex" brand, was prepared by mixing washing soda (sodium
bicarbonate) with a chlorine source, though they might be. If so, then
the white residue that bleach leaves on evaporation would be sodium
bicarbonate -- which would be relatviely harmless in an aquarium. But,
the labels on bottles indicate that it is "hypochlorous acid," -- that
is a water solution of sodium hypochlorite.
So, I remain confused about solid sodium hypochlorite.
David L. McNeely, Ph.D., Professor of Biology
Langston University; P.O. Box 1500
Langston, OK 73050; email: dlmcneely-in-lunet.edu
telephone: (405) 466-6025; fax: 405) 466-3307
home page http://www.lunet.edu/mcneely/index.htm
"Where are we going?" "I don't know, are we there yet?"
----- Original Message -----
From: geoffrey kimber <gkimber2-in-gmail.com>
Date: Thursday, June 9, 2005 2:24 pm
Subject: Re: NANFA-L-- Chlorine Bleach
> the pool stuff I have seen is calcium hypochlorite.
>
> I wonder if the white residue is buffers, or maybe salt?
>
> I searched the web and found several sites that stated that sodium
> hypochlorite is a liquid, so I'm pretty sure it's true but not 100%
> because who can trust the web?
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