Analysis is done by the most appropriate method for what is being looked
for. Impurities will be done typically by AA, whereas quantitative
determination of known major constituents such as tin can be done
gravimetrically, [or by wet chemistry as mentioned in another post].
Differences in results between measuring sites is not unknown, they quite
often are due to sampling technique, as much as analytical process.

Mike Fenner
Indium Corporation of Europe
 T: + 44 1908 580 400
 F: + 44 1908 580 411
M: + 44 7810 526 317


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Barmuta, Mike
Sent: Friday, May 18, 2001 11:41 PM
To: [log in to unmask]
Subject: Re: [TN] Solder Pot Analysis


Kathy: When we analyze our solderpots we use gravimetric for the Sn and AA
for the trace elements, Pb is the remainder.

Over the years we have run multiple analysis from the same sample to cross
check ourselves and outside vendors and their analytical methods. They all
vary a little bit even back to back runs using the same methods. However I
have never seen any dramatic differences between the various techniques. In
most cases the difference in Sn content is in the +/- 0.5% range. This is
close enough and anyone trying to cut it any finer is probably not living in
the real world. I've seen bigger swings in sample to sample variation and
sampling techniques.

By the way it's Kester and Keister no matter what some people would think
:>)




Regards

Michael Barmuta

Staff Engineer

Fluke Corp

Everett WA

425-446-6076

-----Original Message-----
From: Kathy Kuhlow [mailto:[log in to unmask]]
Sent: Friday, May 18, 2001 2:31 PM
To: [log in to unmask]
Subject: [TN] Solder Pot Analysis


What is the most reliable method of solder pot analysis?  I know the Keister
uses the spark analysis and Alpha uses a wet chemistry method (I think).
What are the differences and which is more reliable?

TIA

Kathy

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