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*********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??

 
flyingdog
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User ID: 1244805
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03/28/2011 04:27 AM
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*********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
in fact...I remember from when I was younger and used iodine tincture for making stream water "safe to drink", when there was starch in the water, or introduced to the water, the water would turn PURPLE... is that a valid test for radioactive isotopes of iodine? I can't imagine it would turn as vibrant of a color as I remember from my youth, but would it be detectable? would the color change happen at all?

hopefully a GLPer with some chemistry experience will know how to answer that one.. might make for a "so easy your two year old can do it" testing method

googling is giving me nothing but crap for results

Last Edited by jack363456 on 03/28/2011 04:27 AM
flyingdog (OP)

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03/28/2011 04:42 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
these may be helpful, but I'm not sure what I'm looking at:
WIKIPEDIA: Starch Indicator - [link to en.wikipedia.org]
WIKIPEDIA: Iodine Test - [link to en.wikipedia.org]

seems potassium iodide would have to be present, as well as the radioactive isotope in a high enough concentration ??

so saving some pasta water and dissolving a potassium iodide tab in it would do the trick, if I'm understanding it...

help appreciated
flyingdog (OP)

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03/28/2011 04:57 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
one more go before I let it drop?

bump
Anonymous Coward
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03/28/2011 05:30 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
one more go before I let it drop?

bump
 Quoting: flyingdog


if you ever find out, be sure to update this thread for us...good luck wizard
Anonymous Coward
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03/28/2011 05:50 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
BUMP

I would be interested to know as well.
Anonymous Coward
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03/28/2011 06:16 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
I have just done a bit of googling.

There seem to be a few experiments that use iodine to detect starch.

This experiment could be reversed i suppose to use starch to detect iodine.
Anonymous Coward
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03/28/2011 06:59 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
Iodine Test: When following the changes in some inorganic oxidation reduction reactions, iodine may be used as an indicator to follow the changes of iodide ion and iodine element. Soluble starch solution is added. Only iodine element in the presence of iodide ion will give the characteristic blue black color. Neither iodine element alone nor iodide ions alone will give the color result
Anonymous Coward
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03/28/2011 07:42 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
Chemical reaction tests cannot distinguish between radioactive and non radioactive atoms as the radioactive isotopes will generally react the same as the non radioactive ones.

To detect radioactivity you need a Geiger counter or similar device such as this

[link to www.amazon.com]
Anonymous Coward
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03/29/2011 02:52 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
I am doing some Boiler water titration chemistry right now using Starch Acid, "P" indicator and Iodide-Iodate to measure SO3 concentration which is an Oxygen scavenger.

I have access to many more reagents however I am only following written procedures as I am not a chemist.

If anyone finds a titration testing procedure for these compounds I'd be happy to try.

peace
flyingdog (OP)

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03/30/2011 05:44 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
Chemical reaction tests cannot distinguish between radioactive and non radioactive atoms as the radioactive isotopes will generally react the same as the non radioactive ones.

To detect radioactivity you need a Geiger counter or similar device such as this

[link to www.amazon.com]
 Quoting: Anonymous Coward 1317611


for those of us "inland" and unable to afford a geiger counter, a simple test to find radioactive iodine might be useful...especially if the levels of this shit continue to increase over north america

that's what I'm interested in - the ability of the starch test to detect radioactive iodine (I-131, etc)
flyingdog (OP)

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03/30/2011 05:50 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
I am doing some Boiler water titration chemistry right now using Starch Acid, "P" indicator and Iodide-Iodate to measure SO3 concentration which is an Oxygen scavenger.

I have access to many more reagents however I am only following written procedures as I am not a chemist.

If anyone finds a titration testing procedure for these compounds I'd be happy to try.

peace
 Quoting: Anonymous Coward 986398


if you can simply add plain-old-starch to a mixture of water/radioactive iodine (I-131), then (if no color change) add a drop of diluted KI to the mix...

I'm not much on chemistry myself (haven't been laid in I don't know how many years) but it seems a simple reaction.. iodine, and possibly iodate combined in a 50-50 molar weight, dissolved in water will produce a blue-black coloring when introduced to starch (the iodine/iodate will form covalent bonds to the starch helix, and thus show coloring?)

any help you provide will be thanked by many I'm sure
Anonymous Coward
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03/30/2011 05:52 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
Chemical reaction tests cannot distinguish between radioactive and non radioactive atoms as the radioactive isotopes will generally react the same as the non radioactive ones.

To detect radioactivity you need a Geiger counter or similar device such as this

[link to www.amazon.com]
 Quoting: Anonymous Coward 1317611


Yes you won't be able to tell the difference between radioactive and non-radioactive iodine with a chemistry test. You need a radiation detector, like a dosimeter for example.

[link to www.dosimeter.com]
Anonymous Coward
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03/30/2011 06:03 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
Here is a $10 dosimeter.

[link to store.colemans.com]
Anonymous Coward
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03/30/2011 06:05 AM
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Re: *********************************************** QUESTION FOR GLPER WITH CHEMISTRY BACKGROUND - STARCH TEST FOR RADIOACTIVE IODINE??
$25 for a surplus gamma ray detector

[link to store.colemans.com]

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