Automated titrations with an alternate flow, linear speed, variation system, applications to amperometric, biamperometric, and spectrophotometric titrations

摘要

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 ferrouspermanganate 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 mm and 3 mL, respectively; in titrations where the concentrations of sample and titrant solution are similar; results indicate accuracy better than 1 %.