Daan:

Suspect that Auger analysis (This is pronounced like the name of the famous
basketball star who was tried for murder....OJ) may be the best approach.

The problem with Auger is that it may be too sensitive, as it picks up every
atom on the surface, and there is a trace of almost every element on most
surfaces, so to compensate for this, I recommend you doing Auger on both the
suspect area, as well as a "clean" area, and comparing the results.

This is typically done in labs dedicated to this, and the charge is per hour,
with a minimum charge.  I can tell you where to get this done on the West
Coast of the US, but cannot assist for Europe.

Hope this helps.

Rudy Sedlak
RD Chemical Company

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