Dear Marilyn,

When running marine samples for external clients (which prompted the development of the Inconel insert) using the insert to protect the quartz glass reactor from weakening and developping pin holes or cracks, we used a traditional EA-IRMS set-up with separate combustion and reduction reactors.

Therefore, any HCl formed would have been mopped up by the copper in the reduction reactor.

In all our mass range magnet scans we never saw any peaks at masses where there shouldn't be any signal such as 36 and 38.



Prof. Dr W Meier-Augenstein, CChem, FRSC
Stable Isotope Forensics & Analytical Sciences

Robert Gordon University
School of Pharmacy and Life Sciences
The Ian Wood Building
Garthdee Road
AB10 7GJ

E-mail:   [log in to unmask]
From: Stable Isotope Geochemistry <[log in to unmask]> on behalf of Marilyn Fogel <[log in to unmask]>
Sent: 05 December 2018 16:38:15
To: [log in to unmask]
Subject: [ISOGEOCHEM] Metal EA inserts

Dear Isotopers,

We've been using a metal insert in our Costech EA combustion tube for the last month or so. The good news is that it is easy to clean out ash.

We're using the metal insert because a lot of large powdered, acidified rocks are being analyzed. My question is the following:

With the quartz inserts, some of the HCl generated from combusting salty or acidified samples, reacts with the quartz insert, removing at least a part of it. We use a silver wool plug at the bottom of the combustion reactor for further halide scavenging.

Does anyone else use the metal inserts and see any effects of halides "breaking through" to the Conflo or IRMS?



Dr. Marilyn L. Fogel,
Wilbur W. Mayhew Professor of Geo-Ecology
Director of the Environmental Dynamics and Geo-Ecology Institute (
Dept. of Earth Sciences
University of California Riverside
900 University Ave.
Riverside, CA 92521
[log in to unmask]
Phone: 209-205-6743


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