HOMEBREW Digest #5793 Thu 17 February 2011

[Prev HBD] [Index] [Next HBD] [Back]

		Digest Janitor: pbabcock at hbd.org


                 Sponsor The Home Brew Digest!
     Visit http://www.hbd.org/sponsorhbd.shtml to learn how
    Support those who support you! Visit our sponsor's site!
********** Also visit http://hbd.org/hbdsponsors.html *********

DONATE to the Home Brew Digest. Home Brew Digest, Inc. is a 
501(c)3 not-for-profit organization under IRS rules (see the
FAQ at http://hbd.org for details of this status). Donations
can be made by check to Home Brew Digest mailed to:

HBD Server Fund
PO Box 871309
Canton Township, MI 48187-6309

or by paypal to address serverfund@hbd.org. DONATIONS of $250 
or more will be provided with receipts. SPONSORSHIPS of any 
amount are considered paid advertisement, and may be deductible
under IRS rules as a business expense. Please consult with your 
tax professional, then see http://hbd.org for available 
sponsorship opportunities.

  Re: Chloramine neutralizing (Fred L Johnson)

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Beer is our obsession and we're late for therapy! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * NOTE: With the economy as it is, the HBD is struggling to meet its meager operating expenses of approximately $3500 per year. If less than half of those currently directly subscribed to the HBD sent in a mere $5.00, the HBD would be able to easily meet its annual expenses, with room to spare for next year. Please consider it. Financial Projection As of 19 Jan 2011 Projected 2011 Budget $3271.04 Expended against projection $ 520.75 Projected Excess/(Shortfall) ($2226.61) As always, donors and donations are publicly acknowledged and accounted for on the HBD web page. Thank you Send articles for __publication_only__ to post@hbd.org If your e-mail account is being deleted, please unsubscribe first!! To SUBSCRIBE or UNSUBSCRIBE send an e-mail message with the word "subscribe" or "unsubscribe" to request@hbd.org FROM THE E-MAIL ACCOUNT YOU WISH TO HAVE SUBSCRIBED OR UNSUBSCRIBED!!!** IF YOU HAVE SPAM-PROOFED your e-mail address, you cannot subscribe to the digest as we cannot reach you. We will not correct your address for the automation - that's your job. HAVING TROUBLE posting, subscribing or unsusubscribing? See the HBD FAQ at http://hbd.org. LOOKING TO BUY OR SELL USED EQUIPMENT? Please do not post about it here. Go instead to http://homebrewfleamarket.com and post a free ad there. The HBD is a copyrighted document. The compilation is copyright HBD.ORG. Individual postings are copyright by their authors. ASK before reproducing and you'll rarely have trouble. Digest content cannot be reproduced by any means for sale or profit. More information is available by sending the word "info" to req@hbd.org or read the HBD FAQ at http://hbd.org. JANITORs on duty: Pat Babcock (pbabcock at hbd dot org), Jason Henning, Spencer Thomas, and Bill Pierce
---------------------------------------------------------------------- Date: Thu, 17 Feb 2011 08:30:40 -0500 From: Fred L Johnson <FLJohnson52 at nc.rr.com> Subject: Re: Chloramine neutralizing Tom Logan asked about how to rid his water of chloramine. Since no one offered a response, I thought I should pull up some old posts on the topic for Tom's benefit. (In the process I discovered the search engine at http://hbd.org/cgi-bin/hbdindex.cgi/hbd_index isn't working, at least not on my computer.) My water can contain up to 4 ppm chloramine and 1 ppm free chlorine. Quoting AJ deLange from previous years: - ------------- "The reaction between chlorine and bisulfite is: S2O5-2 + 4Cl + 3H2O --> 2SO4-2 + 6H+ + 4 Cl- With mono chloramine it is: S2O5-2 + 2H2NCl + 3H2O --> 2SO4-2 + 2H+ +2Cl- + 2NH4+ In either case the bisulfite is oxidized to sulfate and the chlorine, while it is not 'removed', is reduced to chloride ion." - ------------- Thus 1 part bisulfite will reduce 4 parts chlorine or 2 parts chloramine. In my particular case, I'll need 0.25 ppm bisulfite to reduce 1 ppm chlorine and 2 ppm bisulfite to reduce 4 ppm chloramine in my water, for a total of 2.25 ppm (plus it is appropriate to add a little excess to reduce the other reducible compounds that will react with the bisulfite found in small amounts in typical drinking water). So let's say I'm targeting 3 ppm bisulfite to treat my water. (A little extra does no harm and may reduce oxidation during mashing.) One mole of sodium metabisulfite weighs 190 g of which 140 g (76%) of it is bisulfite, and 1 mole of potassium metabisulfite weighs 222 g (roughly) of which 140 g (65%) is bisulfite, not very different from each other. You can purchase either of these as a powder. If you are working with campden tablets, I understand that some use the sodium salt and some use the potassium salt, depending on the manufacturer. I have also read that campden tablets weigh anywhere from 0.440 g to 0.550 g, depending on the manufacturer, but I don't really know that they are pure metabisulfite with no fillers. (Can someone confirm this?) If we assume a campden tablet is 0.440 g sodium metabisulfite, one tablet would contribute about 0.334 g bisulfite. To achieve 3 ppm bisulfite, I need to dissolve 334 mg into 111 liters or 29 gallons of water (roughly). Of course, if the campden tablet weighs more than 440 mg, is not pure, or is the potassium rather than the sodium salt, the math changes. And, of course, there is no need to be as precise as I have described in this illustration, considering I was targeting adding an excess of bisulfite in the first place. Fred L Johnson Apex, North Carolina, USA Return to table of contents
[Prev HBD] [Index] [Next HBD] [Back]
HTML-ized on 02/18/11, by HBD2HTML v1.2 by KFL
webmaster@hbd.org, KFL, 10/9/96