Fwd: RE: Iodine devolatizer

[Dave Derenzo <dave@UIC.EDU>]

>Date: Wed, 12 Dec 2001 11:02:17 -0600

>To: "Marco Caceci" <mcaceci@radal.com>

>From: Dave Derenzo <dave@uic.edu>

>Subject: RE: Iodine devolatizer

>

>Dear David A.,

>

>Here is one recipe that I am aware of:

>

>500 ml Deionized Water

>0.4 g Sodium Hydroxide

>15.8 g Hydroscopic Sodium Thiosulfate (anhydrous)

>1 g Pluronic F68 Surfactant (detergent)

>510 g Povidone Iodine

>

>Stir vigorously until everything disolves.

>

>I also found reference regarding the use of a 5% sodium thiosulfate 

>solution or sodium metabisulfate solution (concentration not given) 

>followed by ordinary cleaning methods.

>

>Other advice is not to use bleach or oxidizing agents.  The idea is to 

>keep the solution basic.  Acidic solutions will create iodine vapors.

>

>Dave Derenzo, RSO

>University of Illinois at Chicago

>

>Dave At 10:13 AM 12/12/01, you wrote:

>>Iodide when oxidized (by oxygen, etc.) to iodine becomes volatile.

>>Sodium Thiosulphate, in neutral aqueous solution, would destroy oxygen hence

>>keep the I as iodide. It is cheap, extremely soluble (highly endothermic!)

>>and hardly toxic at all. Want a number, use 200 g/L stock and add a few

>>drops per 10-25 mL. Consider aerated water has some 10 mg/L oxygen, you want

>>to destroy that and any that could get in in time. Beware that Na2S2O3 (sure

>>hope I got that right!) could react with some organics (aldehydes and

>>chetones) and acids.

>>Would not work with I bound (covalently) to organic molecules.

>>Other reductants (vitamin C...) would also work.

>>Knowing what status I- is in (solution? with what else?) would help.

>>

>>Marco

>>

>>

>>

>>-----Original Message-----

>>From: owner-radsafe@list.vanderbilt.edu

>>[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of Engelbretson,

>>David A.

>>Sent: 12 December, 2001 15:00

>>To: 'Radiation Safety Mail'

>>Subject: Iodine devolatizer

>>

>>

>>Would anyone have any recipe or reference information for a solution that

>>would assist in preventing the volatization of iodine-131?  Seems like the

>>recipe included Sodium Thiosulfate.

>>

>>Thanks.

>>

>>Dave

>>

>>

>>************************************************************************

>>You are currently subscribed to the Radsafe mailing list. To unsubscribe,

>>send an e-mail to Majordomo@list.vanderbilt.edu  Put the text "unsubscribe

>>radsafe" (no quote marks) in the body of the e-mail, with no subject line.



************************************************************************

You are currently subscribed to the Radsafe mailing list. To unsubscribe,

send an e-mail to Majordomo@list.vanderbilt.edu  Put the text "unsubscribe

radsafe" (no quote marks) in the body of the e-mail, with no subject line.