Dear James and others interested,

Recommended solutions depend to a great extent on precisely what sort
apparatus you are using or intend to use.

NaCl or KCl works very well, the advantage that the waste product Cl is a
bit easier to neutralize and dispose of.
Moreover, it is less aggressive to a stainless steel line.  It can be used
to treat any quantity of F2.  For small quantities
of F2, I use activated charcoal to produce intert CF4 as a waste product,
thereby avoiding the need to dispose of either
Br or Cl.  The reaction to form CF4 is very exothermic and should be carried
out with care (i.e., low pressure; small quantities
of F2).

Since you are producing SF6 (as I do), you can readily use any of the above
for treatment of excess F2 since you will
have cryogenically separated it.  Other considerations come into play if you
intend to analyze O2.

regards,
Bruce

Bruce E. Taylor, Ph.D.
Research Scientist
Geological Survey of Canada
601 Booth Street
Ottawa, Ontario  K1A 0E8
CANADA

PH:  613-995-4673 (office)
                 992-4046 (lab)
FAX: 613-943-1286
e-mail: [log in to unmask]


> ----------
> From:         James Farquhar
> Reply To:     Stable Isotope Geochemistry
> Sent:         Tuesday, September 12, 2000 15:51
> To:   [log in to unmask]
> Subject:      Passivation of Fluorine
>
> I am writing to ask for advice from people who may have experience with
> different agents (e.g., Zn metal, steel wool, KBr, NaCl, etc...) for
> passivating fluorine.  I am specifically interested in analysis of SF6
> (which condenses at LN2) and therefore in agents that might not produce
> byproducts that would need to be separated from SF6.  Any suggestions
> would be welcome.
>
> Thanks,
>
> James
>
>
> --
>
> James Farquhar
> Dept. of Chemistry, Mail Code 0356
> 9500 Gilman Drive, UCSD
> La Jolla Ca, 92093
> also:
> (on leave from)
> Earth System Science Interdisciplinary Center
> and Department of Geology
> University of Maryland
> College Park, MD
>
> 858 5346053
> 858 5347042 (Fax)
> [log in to unmask]
>