Abstract
ABSTRACT The “alternate flow” method was recently proposed as a solution to the problem connected to the requirement of frequent calibrations of systems utilizing peristaltic pumps. This method was successfully applied to amperometric titrations of the ferrous–ceric system, biamperometric titrations of arsenite–iodine and thiosulfate–iodine systems, and spectrophotometric titrations of ferrous–permanganate and arsenite–iodine systems. Equivalence point determination is possible in the micromolar range of concentrations. Titration times and sample volumes are of the order of 3 min and 3 mL, respectively; in titrations where the concentrations of sample and titrant solution are similar; results indicate accuracy better than 1%.
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