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OfflineJunkFood
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Question about Iodophor
    #6622812 - 03/01/07 12:11 AM (17 years, 2 months ago)

I'm interested in using Iodophor as a sanitizing agent--like, in place of alcohol. I just spent a lot of time reading up on it, and it seems like it's more effective than alcohol. But it seems to be for relatively large-scale things--it's sold as a concentrate (because it's unstable when it's diluted); you're supposed to like, mix 1 tbs. into 5 gallons of water and use it within a week tops, apparantly. So, I was wondering if I could do a small-scale adaptation by putting just a little drop in a spray-bottle filled with water. I read some really great stuff about the way it deals with bacteria and that it even has a potent residual effect, so I'm very interested in using this stuff! What do you guys think?

Can anyone enlighten me as to how to properly dilute this stuff for a relatively small-scale tek?

Links to some of my research (search within the pages--using your browser's search function--for "iodophor"):

http://www.shroomery.org/8431/A-Complete-Guide-to-Cleaning-and-Sanitation
http://tpub.com/content/medical/14274/css/14274_154.htm
http://www.handpaintedglassware.com/brewing/iodophor.html
http://www.allqa.com/IodophorSanitizing.htm

Edited by JunkFood (03/01/07 12:21 AM)

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Invisiblefastfred
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Re: Question about Iodophor [Re: JunkFood]
    #6622935 - 03/01/07 01:17 AM (17 years, 2 months ago)

I think it should work fine. It's a pretty common and proven sterilizing agent.

The way most things like these are diluted is to take the concentrated solution and prepare a stock solution from it, then use the stock solution to prepare the solution you actually use as needed.

Sometimes stock solutions are made for storage reasons, but often it's just to make measurements easier.

Your dilution question is pretty common. Sometimes it's difficult to deal with such small quantities. Some iodophor preparations are effective down to 10-20 ppm, which isn't so easy to just measure out. So what you do is prepare a reasonable stock solution. PPM is parts per million by weight. So 1 ppm is 1mg/L. Sometimes the density of concentrated solution is significantly different from 1g/ml, so that's another reason to use stock solutions. Anyhow, you'll have to prepare a large enough batch that you can measure it at least. I'd guess that the best way would be to dilute 1 ml into 1L of distilled water. 1 ml is 20 drops, so I would put 20 drops into a liter and use that for your stock solution. Then use the stock solution to make up your spray bottles or whatever. Google has a useful feature to convert units, just type in X ___ to ____. Like "4 oz to pounds" and it will give you the answer.

A couple things to remember is that iodophor needs 10-30 minutes contact time and too much organic matter will hinder it's effectiveness. The free iodine varies with different preparations so you need to follow the manufacturers dilution instructions.

Let us know how it works for you.


-FF

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OfflineJunkFood
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Re: Question about Iodophor [Re: fastfred]
    #6623274 - 03/01/07 05:35 AM (17 years, 2 months ago)

Confusing...I wish I could just prepare the 1tbsp./5 gal. solution or whatever and store it, but apparantly that wouldn't last--even if kept completely sealed!

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Invisiblefastfred
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Re: Question about Iodophor [Re: JunkFood]
    #6623325 - 03/01/07 06:07 AM (17 years, 2 months ago)

Just prepare a reasonable stock solution. It's not as confusing as it sounds.

Making a stock solution should work fine. I wouldn't worry about the stock solution going bad on you. By making it with distilled water that should solve most of the problem. I think it's just an issue with the free iodine reacting with ions in tap water that causes most of the storage problem.

Otherwise if you want to keep is simpler you should probably be able to get away with a direct dilution. I don't think the exact dilution is too critical as long as you are fairly close.

So if it's 1tbsp/5gal... that would be .1 tbsp per half gallon. .1 tbsp is 1.478 ml. There's 20 drops to the ml, so that would be about 30 drops to the half gallon.

That should get you pretty darn close. Of course, if you prepared a stock solution you could work it out so that the the measurements are easier. Counting out 30 drops for every spray bottle you need seems like a bit of a pain in the ass to me.


-FF

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OfflineJunkFood
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Re: Question about Iodophor [Re: fastfred]
    #6633258 - 03/04/07 01:16 AM (17 years, 2 months ago)

Thanks for all the help...is there any harm in using too high a concentration (not diluting it enough)?

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Invisiblefastfred
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Re: Question about Iodophor [Re: JunkFood]
    #6633440 - 03/04/07 02:53 AM (17 years, 2 months ago)

Yes. Free Iodine concentration will increase as dilution increases, to a point. You really want to use it at the suggested concentration for maximum effectiveness.


-FF

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Offlinetooth
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Re: Question about Iodophor [Re: fastfred]
    #6638429 - 03/05/07 05:05 PM (17 years, 2 months ago)

don't worry about mixing 5 gal batches at a time, because it is pretty cheap, whatever you don't use just throw away. I use it for sanitizing my brewing equipment, and a small bottle will last me a long time


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