Hi,

I am using ICS-2000. Meat samples tested for Cl, NO2, NO3. AS40 autosampler.

All the standards are fine, spike recovery fine, retention times, areas etc.

From time to time some chromatograms look like sample was not fully injected or it was diluted in the machine.
After reapplying the sample from the same dilution (same bottle) it appears to be fine.

Those strange ones have small peaks. If lets say sample has 3% of salt - it comes out as 0.5 %.
We know the final solution is fine (Volhard method gives us proper salt result + after sample is reapplied and successfully tested we obtain correct result).
It looks that some samples are more "problematic" and need to be repeated couple of times whereas some of them are fine straight away.
:?: :?: :?:
It never happen to standards.

I would appreciate any ideas.