Summary
The present bulletin describes three potentiometric and one photometric titration method for the determination of sulfate. Which indication method is the most suitable depends above all on the sample matrix and is illustrated with examples in thisbulletin.
Method 1: Precipitation as barium sulfate and back-titration of the Ba excess with EGTA. The ion-selective calcium electrode is used as indicator electrode.
Method 2: As in method 1, but with the electrode combination tungsten/platinum.
Method 3: Precipitation titration in semi-aqueous solution with lead perchlorate using the ion-selective lead electrode as indicator electrode.
Method 4: Photometric titration with barium perchlorate, thorin indicator and the 662 Photometer or 525 nm Spectrode. Particularly suitable for micro determinations!
AB_140_3_e.pdf (200 KB)
The present bulletin describes three potentiometric and one photometric titration method for the determination of sulfate. Which indication method is the most suitable depends above all on the sample matrix and is illustrated with examples in thisbulletin.
Method 1: Precipitation as barium sulfate and back-titration of the Ba excess with EGTA. The ion-selective calcium electrode is used as indicator electrode.
Method 2: As in method 1, but with the electrode combination tungsten/platinum.
Method 3: Precipitation titration in semi-aqueous solution with lead perchlorate using the ion-selective lead electrode as indicator electrode.
Method 4: Photometric titration with barium perchlorate, thorin indicator and the 662 Photometer or 525 nm Spectrode. Particularly suitable for micro determinations!
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