Square Wave Titrimetry

Abstract

Square wave titrimetry has been applied to redox, precipitation, and complex formation reactions, lodinearsenite, ferrous-cerium(IV), and ferrocyanide-cerium(IV) reactions gave successful titrations. Equimolar mixtures

Stepwise Titration of Iron(III) and Iron(II) with EDTA and Ferricyanide. The Square Wave Titrimetric End Point

“…A number of instances have been reported by Lorenz and coworkers in which a substance reacting at an electrode is adsorbed substantially (12)(13)(14). It has been suggested that such reactant adsorption may play an important role in the kinetics of electrode reactions (4, [6][7][8][9]IS,16), so that the nature and properties of adsorbed reactants are of general interest.…”

“…The method presented here depends upon the measurement of the slope of the currentvoltage polarization curves of the Fe(III)-Fe(II) system at the null potential using a pair of platinum microelectrodes. Square wave titrimetry (7) achieves this measurement and is essentially the alternating current analog of the Foulk-Bawden "dead stop" The apparatus and theory of square wave titrimetry have been given previously (7). Figure 1A shows the schematic arrangement.…”

Automatic Operations

“…Square wave titrimetry involving a square wrave alternating signal at constant current or voltage amplitude applied to a pair of microelectrodes has been described by Laitinen and Hall (146)• Applications to redox, precipitation, and complexation reactions w'ere described. Jordan and Alleman (130) have designated "enthalpy titrations" for titrimetric methods depending on heats of reaction.…”

Polarographic Theory, Instrumentation, and Methodology

“…The polarographic method has been suggested for the measurement of transference numbers (70) and diffusion coefficients (124). Gatos (85) has noticed that use of polyethylene tubing and containers results in the suppression of some polarographic maxima, presum-ably7 due to extraction of the capillary actixre materials. Vouk, ICarmalkar, and Weber (162) recommend leastsquares treatment of polarographic data for interpretir g composite curves of closely7 spaced xx7a\7es such as those of lead and thallkm.…”

“…(85) have introduced a new' method of titrimetry based on square-wave electrolysis.LITERATURE CITED (1) Alimarin, J. P., Galla!, Z. A., Zavadskaya Lab.…”