CONSTRUCTION AND EVALUATION OF TUBULAR POTENTIOMETRIC DETECTORS SENSITIVE TO CHLORIDE, BROMIDE, AND IODIDE AND BASED ON HOMOGENEOUS CRYSTALLINE MEMBRANES

The construction of tubular potentiometric detectors is described, without an inner reference solution, sensitive to chloride, bromide, and iodide. They are based on homogeneous crystalline membranes obtained by high-pressure pressing of AgX/Ag2S powdered mixtures (X = Cl, Br and 1). The respective operating characteristics are evaluated by comparison with conventionally-shaped electrodes with the same sensor. In general, the detectors showed similar operating characteristics as those of the corresponding conventional electrodes, namely the concentration range, in which they presented a Nernstian response, an excellent reproducibility, and an extremely rapid response rate which in some cases enabled the FIA manifolds to attain sampling rates of 360 samples/h.