[meteorite-list] Nickel test kit

From: Tom aka James Knudson <knudson911_at_meteoritecentral.com>
Date: Thu Apr 22 10:29:59 2004
Message-ID: <005f01c38188$a7de3980$8fc143d8_at_malcolm>

Hello Again, The test kits seem to get old. I tested a lot of meteorites
with the ebay test kits with good results, but a few months later, they did
not work. So you have to test all 500 tests worth in a short time. :

Thanks, Tom
Peregrineflier <><
The proudest member of the IMCA 6168
----- Original Message -----
From: Matson, Robert <ROBERT.D.MATSON_at_saic.com>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Monday, September 22, 2003 9:01 PM
Subject: [meteorite-list] Nickel test kit


> Hi Mike,
>
> The standard nickel test (based on dimethyl glyoxime) can produce
> false positives and false negatives because it is very sensitive
> to the cleanliness of the containers in which it is carried out.
> I haven't experimented any with the kits I've seen listed on eBay
> from time to time, so I can't give you any feedback on their
> reliability. But I ~can~ tell you that when I performed the full-
> blown test in a beaker back in my university days, the results
> were very sensitive to how well the glassware had been cleaned.
>
> Because of that experience 20-odd years ago, I have avoided
> nickel testing with candidate iron meteorites. It's much simpler
> to just polish a surface and etch it with ferric chloride.
>
> --Rob
>
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Received on Tue 23 Sep 2003 12:10:40 AM PDT