AN-CS-002
Date
Ammonium – Sequential suppression with linear calibration
Summary
Ammonium determination after sequential suppression frequently exhibits non-linear calibration curves. The reason for this is the ammonium hydroxide that arises and that is present in a form characterized by low dissociation. The sequential cation suppression forms the more highly dissociated ammonium hydrogen carbonate. Ammonium and the other standard cations exhibit linear calibration curves (R > 0.9997).