We recently discovered a difference in procedure for extraction of salts for ion chromatography.  After soaking in IPA at 80°C for an hour, what should be done with the sample?  IPC-TM-650 2.3.28 doesn't specifically state that the PCB should soak in the IPA solution while cooling.  The extraction described in IPC-TM-650 2.3.25.1 requires that the PCB remain in the Kapak bag for half an hour while cooling.

Should the solution be shaken or otherwise agitated?  IPC-TR-583 would suggest that a static extraction is less efficient.  In the situation I'm in, these additions resulted in significantly different results.  The tests were requested in order to troubleshoot a solderability problem so the procedural question is more academic.  I'd just like to know if my methods are inconsistent with accepted practices.

Neil Flatter
Process Quality
TRW-Automotive

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