| About This Archive | | DCHAS-L 2013 Index | | DCHAS-L Yearly Index | |
Check out Safety Emporium for your N95, N99, and face shield needs.
|
Previous by Date: Subject: Re: [DCHAS-L] EDTA in cleanup of aqueous radioisotope solution Date: April 15, 2013 4:35:57 PM EDT Author: Edward Movitz |
Next by Date: Subject: Re: [DCHAS-L] EDTA in cleanup of aqueous radioisotope solution Date: April 16, 2013 7:37:34 AM EDT Author: Harry Elston |
When you asked I figured EDTA was used because it is a chelating-ligand
(because it binds to a metal or matalloid using more than one atom) but I
haven't found anything specific. I did find one paper (see below) which
mentions using it because it is an "aggressive chelate". Also found
several colleges/universities that include EDTA in their clean up
protocols but of course don't go into the chemistry of it. The
contaminated solution would go to the radiation safety personnel for
proper disposal....obviously couldn't go down the drain. I figure with
more digging than I did you could find some references.
The following is from: Radwaste Equipment Corrosion Associated with
Exposure
To Chemical Cleaning Solution
John Freeman
Senior Treatment Systems Specialist
Wolf Creek Nuclear Operating Corp.
1550 Oxen Lane, N.E.
Burlington, Kansas 66839
jofreem**At_Symbol_Here**wcnoc.com
Charles Jensen
Diversified Technologies Services, Inc.
2680 Westcott Boulevard
Knoxville, TN 37931
cjensen**At_Symbol_Here**dts9000.com
here is the link: http://www.dts9000.com/epri06-equip-corrosion.pdf
"Despite continual tweaking of formulation and application, EDTA-based
decontamination is a
well-established process. EDTA is an aggressive chelate that is very
effective for removing and
sequestering metals. While other chemicals are used to enhance metal
removal or transport, or
reestablishment of the passivated layer, EDTA remains the key
constituent."
Mel
Mel Charlton-Smith
Chemical Hygiene Officer, Lab Coordinator, Lecturer
BS-CHO program
Department of Chemistry
WV Wesleyan College
Buckhannon, WV 26201
charltonsmith**At_Symbol_Here**wvwc.edu
304-473-8355
-----Original Message-----
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf
Of Buczynski, Michael
Sent: Monday, April 15, 2013 4:34 PM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: Re: [DCHAS-L] EDTA in cleanup of aqueous radioisotope solution
EDTA is often added to a cleaning solution(laundry detergent) to help tie
up hard water metals and minerals were you to use a detergent without
EDTA for laundry in areas that have hard water (iron) clothes would look
dirty after the wash
-----Original Message-----
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf
Of Strode, Kyle
Sent: Monday, April 15, 2013 1:32 PM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: [DCHAS-L] EDTA in cleanup of aqueous radioisotope solution
I'm teaching a unit on EDTA and its myriad uses in chemistry. I read
somewhere about why EDTA is often present in the cleaning solution used to
sponge up spills of low-level radioactive aqueous solutions. Two
questions:
1) How/why does EDTA enhance the cleanup from a chemical perspective?
I'm sure it has to do with the high Kf value for complexation, but I'd
love a confirmation.
2) What is done with the contaminated solution after sponging off the
area?
*The information contained in this message may be confidential and/or
subject to legal privilege, and is for the use of the intended addressee
only. Any unauthorized use, dissemination or copying of the information
in this message is strictly prohibited. If you have received this message
in error, please notify the sender immediately and delete this message.*
Previous post | Top of Page | Next post