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Black Corona needle

http://www.chromforum.org/viewtopic.php?t=13926

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Black Corona needle

Posted: Sun Sep 26, 2010 5:51 am
by abr856
I know it is usual to have ash build up on the corona needle, but sometimes the corona needle turns black with a more solid residue. Can anyone suggest what would cause this?

Thanks.


MA.

Posted: Fri Oct 15, 2010 11:28 am
by Ken
Sample matrices will caused deposits not only at the corona discharge needle but also on the ion source itself ~
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