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Subject:
From:
"Karlsson, Hal" <[log in to unmask]>
Reply To:
Stable Isotope Geochemistry <[log in to unmask]>
Date:
Fri, 5 Nov 2004 14:48:26 -0600
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Hello all,

I have been working with an American company as a go-between for the Chinese BrF5.  They ship the stuff from China, handle customs, and put the reagent in certified tanks.  We have received our reagent but have not tested it yet.

Hal


-----Original Message-----
From: Stable Isotope Geochemistry on behalf of Ed van Hees
Sent: Fri 11/5/2004 1:50 PM
To: [log in to unmask]
Subject: Re: [ISOGEOCHEM] Fluorination agent
 
Hello Georges:

         Bruce Taylor at the Geological Survey of Canada has had lots of 
"experience" with the product quality as well as the bad tank, poor valves, 
non-delivery via Canada Post etc. provided by the Chinese supplier and 
advised me to stay clear of this source for BrF5.   Ozark-Mahonig bought 10 
kg of BrF5 from this same source about 1.5 years ago and had lots of 
problems, as was discussed on this list server.

         I have looked hard for 2 years and managed to find 400 gm of BrF5 
that was part of an old-lot, but I have not been able to find any more.

         ClF3 has the problem that you need to add the stochiometrically 
correct amount of reagent to the sample from which you are trying to 
liberate O2.  That requires some time to calibrate your extraction 
line.  An additional problem is that many of the companies that list ClF3 
among their products have gotten out of the business or will not sell it to 
you for reasons such as "1 kg is too small an order for us to handle".

         I hope this helps

         Ed


>Dear List members,
>
>I have run out of BrF5...
>
>I have had contacts with several people regarding
>current supply of BrF5. There seems to be only
>one supplier of BrF5 worldwide, Wuhan in China.
>
>I have had mixed reports from fairly good to
>fairly bad regarding this supplier. Some
>materials received in France was of good quality,
>whereas some sent to Canada contained apparently
>less than was sold..
>
>At issue also was the security of the gas bottle,
>with leaky or breaking valves.
>
>Does anyone has purchased BrF5 recently from
>Wuhan and if so how was it? Any other reliable
>supplier known?
>
>Another solution is to switch to ClF3. There is a
>North America supplier of ClF3, Advanced Research
>Chemicals (www.fluoridearc.com) that gave a quote
>at 1210$/kg.
>
>Does anyone purchased ClF3 recently from ARC, or
>is there other reliable suppliers?
>
>Finally, should I expect extraction problems using ClF3, compared to BrF5?
>
>Thank you all for your help!
>--
>Georges Beaudoin, Géo., Ph.D.
>Professeur titulaire
>Directeur du programme de géologie
>Département de géologie et de génie géologique
>Université Laval
>Québec, Qc
>Canada G1K 7P4
>tel. 418-656-3141
>fax. 418-656-7339
>
>Visitez ma page WEB
>http://www.ggl.ulaval.ca/personnel/beaudoin/GeorgesBeaudoin.html

Ed van Hees Ph.D., P.Geo.

Assistant Professor
Room 0224 Old Main
Department of Geology
Wayne State University
Detroit, MI 48202
Phone 1-313-5779436
Fax     1-313-5770517

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