1. Deionized water (ion exchanged), although adequate for most
analytical work, can be left a little "protic" from the deionization
process which others noted left the water acidic. This will corrode
your plumbing. I have heard it can actually be aggressive towards
your pipes. Distilled water is usually recommended by manufacturers
of cooling systems. Having a pretty decent DI system but lacking a
distillation unit I buy my distilled water at the grocery store and
get the stuff used for babies. Be sure that it is not fluoridated,
which many are. I keep a few extra on hand.
2. Sounds like your PA tube to me but can't be sure until you replace
it. If the system is old and the tube was never replace d I would say
it is a good bet. I think you can do it yourself and save a few
$1000. There was a bit of discussion on this last week. You may be
able to get one for <$1000.
______________________________ Reply Separator
Subject: ICP questions
Author: "James Burton" <SMTP:[log in to unmask]> at chicago1
Date: 11/01/1999 2:24 PM
<TWO torchbox/matchbox failures on two machines in two weeks!>.
1> The Finnegan ELEMENT matchbox explicitly states that deionized water
is destructive and NOT to be used for cooling. I presume distilled
water is appropriate. Can someone tell me what is the *relevant*
difference? Also would distilled deionized be OK (or deionized
2> On an old ARL optical ICP, no plasma ignition. I get the buzz from
tesla, but no streamers or ANY visualization of the spark. The RF
generator appears to be OK power-wise and tuning; the reflected power is
minimized, BUT changing the capacitance of the load-coil (via the
matchbox load-coil capactor) makes NO difference in the reflected power
through the entire range of the capacitor - is this a clue? (The tuning
capacitor DOES dip the reflected power to a minimum).
U. Wisconsin - Madison