FLOW-INJECTION TITRATION OF CHLORIDE IN FOOD-PRODUCTS WITH A SILVER TUBULAR ELECTRODE BASED ON AN HOMOGENEOUS CRYSTALLINE MEMBRANE

A flow injection system for the pseudo-titration of chlorides in food products with potentiometric detection has been developed. For this purpose, a silver ion selective tubular electrode based on a homogeneous crystalline membrane, prepared by pressing silver sulphide at high pressure, was constructed. Its operational characteristics were evaluated and compared with the corresponding conventionally shaped electrodes obtained with the same sensor. The results obtained for chloride determination in wine, milk, beer and vinegar by using the FIA methodology were in good agreement with those provided by reference procedures. The sampling rate achieved varied between 120 and 360 samples per hour.