Metrohm presents its new 859 Titrotherm: In order to obtain 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. A typical example of a thermometric titration is the less well-known exothermic reaction in which the mineral elpasolite (NaK2AlF6) is formed from sodium, potassium, aluminum and fluoride ions. The industrial determinations of sodium, aluminum and fluoride are based on this reaction; these are all known as versions of the elpasolite method.