How do I remove the negative dip and the peak at retiontime of NO2- with high salt samples?

Christel Bastiaenssens @Christel-Bastiaenssens

27 November 2020 0 2K Report

I use an IC-method with UV detection because I have samples with high chloride amount app6g/L.

I get a negative dip before the NO2- peak and a peak that is higher than normal in these samples.

Did test with MilliQ water and salt and had a negative dip with an NO2- peak even that I didn't put anything in it.

How can I avoid this?

My column is an AS14 column with guard from Thermo.

I can use AG cartridges from Thermo but this is not allowed.

Can someone give me some tips?

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