Mettler Toledo T5 Excellence

Potentiometric titrator for carbonate and bicarbonate analysis (alkalinity) or acid-base kinetics

titrateur

Instrument description

The potentiometric titrator (Mettler Toledo T5 Excellence) allows to measure the concentrations of carbonate and bicarbonate ions in natural waters. It also measures the kinetics of acid-base equilibria.

Principle of analysis

A liquid sample (of known volume) is introduced into a beaker. A magnetic bar stirs the solution (a colored indicator can be added). A precision syringe adds an acid or base of known concentration to the solution. When the addition of acid or base causes the pH to vary, the instrument measures the inflection points of the pH curves. For alkalinity, around pH=8.3 is the first equivalence point which corresponds to the transformation of carbonate ions into bicarbonate ions, then a second equivalence point corresponding to the transformation of bicarbonate ions into carbonic acid around of pH=4.3. It gives the alkalinity of the sample.
See principle of measurement here: https://chimieanalytique.com/potentiometrie/

Analyses performed on the instrument

  • Carbonate (CO32-) and bicarbonate (HCO3-) ions for alkalinity measurement with an accuracy of +/- 5%, 20 mL minimum sample for analysis.

Contacts

Gaël Monvoisin : 01.69.15.71.74 / This email address is being protected from spambots. You need JavaScript enabled to view it.

Fundings

OSUPS Sciences of the Univers Observatory of university Paris-Saclay: Year 2020. OSUPS