If you have filters with high C:N, I would consider decarbonating them
using acid treatments (e.g. exposure to HCl fumes). Carbonates usually
have a poor combustion.
David X. Soto, Ph.D.
Marie Curie Fellow
Department of Earth and Environmental Sciences
3001 Leuven, Belgium
On 2017-04-12, 1:08 PM, "Sofia Goncalves" <[log in to unmask]>
>Dear Isogeochem members,
>We are analysing some difficult samples of POMs for d15N and d13C on our
>EA 2000 IRMS Delta V Advantage. These samples are colleted and analyzed
>on filters and have a high C/N.
>Some of these samples gives peaks with strange shape and integration. The
>separation is not good either.
>The analytical conditions are as follows:
>- carrier flow 90ml/min
>- oxygen flow: 200ml/min
>- reference flow: 200ml/min
>- ox. reactor: 1020 Celsius
>- red. reactor: 650 C
>- oven: 45 C
>Could anyone help me improve this type of analysis?
>Thank you very much.