Tap water samples | Ion-complexing compound | Ca2+ [mg/L] potentiometric titration with ASS sensors | Ca2+ [mg/L] colorimetric titration |
Strasbourg (France) | I | 70 | 72 |
Freiberg (Germany) | II | 26 | 28 |
Garda (Italy) | I | 32 | 35 |
Kolobrzeg (Poland) | II | 84 | 87 |