Automated determination of sodium in milk with thermometric titration
AB-343
en
This bulletin discusses automated determination of sodium in milk products available to the public using a 859 Titrotherm and a 814 USB Sample Processor. The sodium content of milk can be rapidly and easily titrated thermometrically with a standard solution of Al3+ as titrant. Thermometric titrations are conducted under conditions of constant titrant addition rate. The molarity of the titrant is computed automatically in tiamoTM (software) with the SLO command. Results are reported as mg Na/100 mL. In addition to this application bulletin, you can find more information on thermometric sodium determination in foods in our application video available on YouTube:https://youtu.be/lnCp9jBxoEs
Sodium reacts exothermically with aluminum in the presence of an excess of potassium and fluoride ions to produce NaK2AlF6 (elpasolite). This reaction can be used to rapidly and easily determine the sodium content of milk by thermometric titration with a standard solution of Al3+ as titrant.
Thermometric titrations are conducted under conditions of constant titrant addition rate. As the reaction that takes place is exothermic, the temperature rises, and the point at which the temperature curve bends marks the endpoint.
In addition to this Application Bulletin, you can find more information on thermometric sodium determination in foods in our application video: