for the simultaneous analysis of the cations li , na , k , ca , and mg as well as mn and the anions hydrogen carbonate , chloride , sulfate and nitrate , silica gel- and polymer-based ion exchange materials with conductivity and spectrophotometric detection combined with a post-column derivatization system ( par-zn-edta for ca , mg , mn ) and also an ion-pair system with rp-18 phase were compared with a view to their application to mineral water samples .
C0003075
anions
C0028125
nitrate