Sodium Determination Using Ion-Selective Electrodes, Mohr Titration, and Test Strips

Sodium content of foods can be determined by various methods, including an ion-selective electrode (ISE), the Mohr or Volhard titration procedure, or indicator test strips. Some of these methods are official methods of analysis for specific products, and all these methods are faster and less expensive procedures than analysis by atomic absorption spectroscopy or inductively coupled plasma-optical emission spectroscopy. This laboratory exercise allows one to compare sodium analysis of several food products by ISE, Mohr titration, and Quantab® chloride titrators.