With the aid of thermometric titration, the elpasolite method offers a quick, reliable and accurate method for determining sodium, aluminium and fluoride ions in numerous different sample matrices
In order to obtain a sharp endpoint and therefore reproducible results with potentiometric titration methods, the reactions upon which the titration is based must result in sufficiently large alterations in electrochemical quantities in the solution to be titrated.
In thermometric titrations such alterations can be considerably smaller and still produce extremely accurate results - only one of the many advantages of this method! A typical example of a thermometric titration is the less well-known exothermic reaction in which the mineral elpasolite (NaK2AIF6) is formed from sodium, potassium, aluminium and fluoride ions.
The industrial determinations of sodium, aluminium and fluoride are based on this reaction; these are all known as versions of the elpasolite method.
Metrohm says its 859 Titrotherm is the suitable favourably-priced instrument for these determinations.
