Re: NANFA-L-- Chlorine Bleach

Welaka T. Phishhed (welaka75-in-yahoo.com)
Thu, 9 Jun 2005 13:10:11 -0700 (PDT)

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I found this . . .
"To say that chlorine bleach does not contain chlorine is true, but somewhat
misleading. True, it does not contain diatomic chlorine gas, CL2. It does
contain sodium hypochlorite, NaOCl, which is one of the products produced
when aqueous sodium hydroxide (caustic soda) reacts with Cl2. (The other
product is sodium chloride, NaCl.) It is a very strong oxidizing agent.
Some non-chlorine bleaches contain slightly weaker oxidizing agents, which
will oxidize the colored molecules in many common stains, but not the
robust pigments of commercial textile dyes. That's what makes them
"color-safe." It's a trade-off: if the stain is a tough molecule (such as
turmeric, the vegetable dye used to make mustard bright yellow), the
strength of bleach required to oxidize it will also destroy the textile's
color."

WARREN

dlmcneely-in-lunet.edu wrote:
You're right about the calcium hypochlorite. My mistake there. But I
found this

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
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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Best Wishes !

WARREN
*-::-:*'''''*:-::-*
(Welaka T. Phishhed)
WELAKA CREATIONS
(E-BAY...photoguy6900)
welaka75-in-yahoo.com


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<DIV>I found this . . .</DIV>
<DIV>"To say that chlorine bleach does not contain chlorine is true, but somewhat<BR>misleading.&nbsp; True, it does not contain diatomic chlorine gas, CL2.&nbsp; It does<BR>contain sodium hypochlorite, NaOCl, which is one of the products produced<BR>when aqueous sodium hydroxide (caustic soda) reacts with Cl2.&nbsp; (The other<BR>product is sodium chloride, NaCl.)&nbsp; It is a very strong oxidizing agent.<BR>Some non-chlorine bleaches contain slightly weaker oxidizing agents, which<BR>will oxidize the colored molecules in many common stains, but not the<BR>robust pigments of commercial textile dyes.&nbsp; That's what makes them<BR>"color-safe."&nbsp; It's a trade-off:&nbsp; if the stain is a tough molecule (such as<BR>turmeric, the vegetable dye used to make mustard bright yellow), the<BR>strength of bleach required to oxidize it will also destroy the textile's<BR>color."<BR><BR>WARREN<BR><BR><B><I>dlmcneely-in-lunet.edu</I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">You're right about the calcium hypochlorite. My mistake there. But I <BR>found this<BR><BR>http://www.inchem.org/documents/pims/chemical/pim495.htm<BR><BR>"IPCS INCHEM is a means of rapid access to internationally peer <BR>reviewed information on chemicals commonly used throughout the world, <BR>which may also occur as contaminants in the environment and food. It <BR>consolidates information from a number of intergovernmental <BR>organizations whose goal it is to assist in the sound management of <BR>chemicals.<BR><BR>Sodium hypochlorite<BR><BR>Composition/Purity: Usually sold in solutions<BR>containing 5 to 15% sodium hypochlorite in water, <BR>with<BR>0.25 to 0.35% free alkali (usually NaOH) and 0.5 to<BR&
find on the web discussed as liquid sodium <BR>hypochlorite the water solution used as bleach, not the pure material. <BR>And I found nothing that indicated that commercially available bleach, <BR>including 'Purex" brand, was prepared by mixing washing soda (sodium <BR>bicarbonate) with a chlorine source, though they might be. If so, then <BR>the white residue that bleach leaves on evaporation would be sodium <BR>bicarbonate -- which would be relatviely harmless in an aquarium. But, <BR>the labels on bottles indicate that it is "hypochlorous acid," -- that <BR>is a water solution of sodium hypochlorite.<BR><BR>So, I remain confused about solid sodium hypochlorite. <BR><BR>David L. McNeely, Ph.D., Professor of Biology<BR>Langston University; P.O. Box 1500<BR>Langston, OK 73050; email: dlmcneely-in-lunet.edu<BR>telephone: (405) 466-6025; fax: 405) 466-3307<BR>home page http://www.lunet.edu/mcneely/index.htm
Original Message -----<BR>From: geoffrey kimber <GKIMBER2-in-GMAIL.COM><BR>Date: Thursday, June 9, 2005 2:24 pm<BR>Subject: Re: NANFA-L-- Chlorine Bleach<BR><BR>&gt; the pool stuff I have seen is calcium hypochlorite.<BR>&gt; <BR>&gt; I wonder if the white residue is buffers, or maybe salt?<BR>&gt; <BR>&gt; I searched the web and found several sites that stated that sodium<BR>&gt; hypochlorite is a liquid, so I'm pretty sure it's true but not 100%<BR>&gt; because who can trust the web?<BR>&gt; /------------------------------------------------------------------<BR>&gt; -----<BR>&gt; / This is the discussion list of the North American Native Fishes<BR>&gt; / Association (NANFA). Comments made on this list do not necessarily<BR>&gt; / reflect the beliefs or goals of NANFA. For more information <BR>&gt; about NANFA,<BR>&gt; http://www.nanfa.org
To subscribe, unsubscribe, <BR>&gt; or get<BR>&gt; / help, visit the NANFA email list home page and archive at<BR>&gt; / http://www.nanfa.org/email.shtml<BR>&gt; <BR>&gt; <BR>/-----------------------------------------------------------------------<BR>/ This is the discussion list of the North American Native Fishes<BR>/ Association (NANFA). Comments made on this list do not necessarily<BR>/ reflect the beliefs or goals of NANFA. For more information about NANFA,<BR>/ visit http://www.nanfa.org Please make sure all posts to nanfa-l are<BR>/ consistent with the guidelines as per<BR>/ http://www.nanfa.org/guidelines.shtml To subscribe, unsubscribe, or get<BR>/ help, visit the NANFA email list home page and archive at<BR>/ http://www.nanfa.org/email.shtml<BR><BR></BLOCKQUOTE><BR><BR><DIV>
<DIV>
<DIV>
<DIV>
<DIV><STRONG><FONT color=#007f40 face="comic sans ms" size=4>Best Wishes !</FONT></STRONG><BR></DIV>
<DIV><FONT color=#007f7f face="comic sans ms" size=4><STRONG>WARREN</STRONG></FONT> <IMG src="http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/50.gif"></DIV>
<DIV><STRONG><FONT color=#00407f size=3>*-::-:*'''''*:-::-<STRONG><FONT color=#00407f size=3>*</FONT></STRONG></FONT></STRONG><BR><STRONG><FONT color=#00407f size=3>(Welaka T. Phishhed)</FONT></STRONG></DIV>
<DIV><FONT color=#00bf60 face="Arial Black"><STRONG>WELAKA CREATIONS</STRONG></FONT></DIV>
<DIV><FONT color=#7f007f face=verdana size=3><STRONG>(E-BAY...photoguy6900)</STRONG></FONT></DIV>
<DIV><FONT color=#40007f face=verdana><A href="welaka75-in-yahoo.com">welaka75-in-yahoo.com</A></FONT></DIV>
<DIV><FONT color=#40007f face=Verdana></FONT>&nbsp;</DIV>
<DIV>&nbsp;</DIV></DIV></DIV></DIV></DIV><p>__________________________________________________<br>Do You Yahoo!?<br>Tired of spam? Yahoo! Mail has the best spam protection around <br>http://mail.yahoo.com
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/ reflect the beliefs or goals of NANFA. For more information about NANFA,
/ visit http://www.nanfa.org Please make sure all posts to nanfa-l are
/ consistent with the guidelines as per
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