[meteorite-list] nickel test

From: John Gwilliam <jkg_at_meteoritecentral.com>
Date: Thu Apr 22 10:06:57 2004
Message-ID: <4.2.0.58.20021008082116.009c7850_at_pop3.norton.antivirus>

Hello All,
The process described below can result in some false positives. When
working with such a small test specimen, it is imperative you don't
contaminate it during handling or preparation. If you cut and polish
meteorites regularly, you will have an accumulation of dust in your work
area that contains nickel. Setting your specimen on a table or handling it
with contaminated gloves can introduce enough nickel to result in false
positive.

The proper spelling for the chemical being discussed here
is "Dimethylglyoxime" (2,3-Butanedione Dioxime).

Regards,

John Gwilliam


At 10:19 PM 10/7/02 -0400, mafer_at_domafer.com wrote:
>Hi Tom
>This is out of Meteorites Messengers from space by Heide and Wlotzka: I've
>added my comments in ()First, a small portion of the metal has to be
>disolved in acid. This can
>be achieved by placing a drop of dilute hydrocloric acid 10% on the metal
>surface. (this is avail all over and may be called muratic acid, the stuff
>they use in pools...this in my imput not the authors)Atfer some time the
>acid will become yellow by the disolved iron. It can
>now be removed with a pipette (or glass eye dropper I should think) and
>placed on a white porcellain plate. (don't let your wife catch you using
>her plates and make sure to turn it over and use the unglazed side so you
>don't introduce outside metals used in the glaze, or use a piece of
>unglazed floor tile) Here the acid is neutralized with a drop of dilute
>ammonia. The proof of nickle is accomplished with dimethylgloxime. (you
>might have to call around for this substance, try some pharmacies, or if
>you know someone in a university lab, they may have it) A drop of 1%
>solution of this reagent in alcohol (if you have a 100 ml vial, one
>percent would be 1 ml of reagent, and fill the vile to the 100 ml line
>with ethyl alcohol) is applied to the test solution. If nickle is present,
>a red color or precipitation (precipitation will look like little red
>flakes, very small)develops.Hope this helps you
>Mark
> >
> > Hello List, Can any one tell me how to do a nickle test in a simple
> > easy to understand&nbsp; way? I have no back ground in chemistry. : )
> >
> > Thanks, Tom
> >
> > The proudest member of the I.M.C.A. #6168
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Received on Tue 08 Oct 2002 11:41:37 AM PDT