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Thanks for the suggestion, I am going to try that!

Matheus C. Carvalho
Senior Research Associate
Centre for Coastal Biogeochemistry Research
Southern Cross University
Lismore, NSW, Australia
61-4-8899-0092
https://www.youtube.com/channel/UC6X_viFhqGovGtWIedEUSkA
<http://is.gd/istopematheus>

On Mon, Feb 1, 2016 at 9:49 AM, Marilyn Fogel <[log in to unmask]> wrote:

> I suspect some sulfurous compounds. Do you have silver wool at the bottom
> of your combustion reactor? I suggest a good cm or two, more than normal.
> Change it frequently. Marilyn
>
> From: Stable Isotope Geochemistry <[log in to unmask]> on behalf of
> Matheus Carvalho <[log in to unmask]>
> Reply-To: Stable Isotope Geochemistry <[log in to unmask]>
> Date: Sunday, January 31, 2016 at 2:44 PM
> To: "[log in to unmask]" <[log in to unmask]>
> Subject: tubes cracking in the chromium oxide band
>
> Dear all, I have been analyzing some sediment samples from mangroves for C
> and N isotopes on a Flash EA - Delta V plus setup, and I have noticed that
> after running a number of them (about 50) the oxidation tube cracks at the
> chromium oxide band. This does not happen with any other samples. In
> addition, these same samples tend to clog the stainless steel lines, and
> apparently also damage the gc column. Not the kind of sample I wish to run
> often. Does anyone have an idea of the possible reason for such phenomena?
> Thank you,
>
>
> Matheus C. Carvalho
> Senior Research Associate
> Centre for Coastal Biogeochemistry Research
> Southern Cross University
> Lismore, NSW, Australia
> 61-4-8899-0092
> https://www.youtube.com/channel/UC6X_viFhqGovGtWIedEUSkA
> <http://is.gd/istopematheus>
>