As other pointed out, you need put quartz wool (we use 1cm and packed tight) at the end with slashes and put that end as bottom. You can reuse it as long you do not break it when you get rid of ashes and replace the quartz wool.
Sercon provide these inserts. They also have insert with one closed end at the bottom. So you don't need use the quartz wool, but they can not be reused.
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Yanhua Feng
Sent: Thursday, 19 November 2009 9:58
To: [log in to unmask]
Subject: [ISOGEOCHEM] insert tube for ash removal
We have a EuroVector EA 3000 for CN analysis. I am always concerned
about incomplete combustion after some ash piled in the combustion tube.
especially with acid fumigation samples, I use two silver capsules for each
I heard that there is a way to remove the ash with an insert tube. I am
wondering if anyone has experience on that. We have a few tubes in the lab. I
think that they are insert tubes. 22cm long, transparent glass, thin wall, 4
slots on one end. But there is nothing to tell me how to use them. the end
with slots should be on the top or the bottom. etc.
I could also buy some new ones if someone can tell me which kind fit my
appreciate any suggestion.
New Mexico State University
Plant & Environmental Sciences
Las Cruces, NM 88003