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Stable Isotope Geochemistry

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Subject:
From:
Irene Ellis <[log in to unmask]>
Reply To:
Stable Isotope Geochemistry <[log in to unmask]>
Date:
Wed, 29 Jun 2005 18:52:14 -0400
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Cleaning an ion source with solvents will leave a thin film of the
azeotrope unless precautions are taken.

This is the sequence that I used for the metal parts:

--non-ionic soap and water after polishing off all carbon and sonicate 15
min.

--deionized water 3X and sonicate each time

--methanol to cover, sonicate, decant and drain as much as possible by
capillary action to kimwipes (metal parts stay in beaker, drain at lip)

--chloroform to cover, sonicate, and decant.  Bake dry at 80C (about an
hour).  The beakers can then be sealed with new Al foil.  Store in
dessicator if waiting longer than overnight.

This leaves all parts clean and the source will not need to bake out longer
than the time to pump down.

To clean ceramics, put into clean crucible and bake overnight at 1200C.  No
need to scrape or sandblast--the carbon just evaporates perfectly. NB you
will destroy MACOR insulators this way if any such nasties are lurking in
the same lab (personal pet peeve).

Irene Ellis
IsoTrace Lab, U of T

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