Application of flow-injection potentiometric system for determination of total concentration of aliphatic carboxylic acids

Linear response towards carboxylic acids was observed in the concentration range of 10−4 to 10−2 mol dm−3, with the slopes in the range of −110 to −150 mV dec−1 (for acetate− and butyrate−, respectively). System enables for determination of about 6 samples per hour. Life time of ISEs average about 2 months.