Polarographic Determination of Metal Driers in a Nonaqueous Solution

Abstract

ure 1 is a polarogram of a solution containing 3.76 X 10~4M arsenic as arsenite ions, whereas curve B is a polarogram of the same solution but without arsenic. The increase in current of the solution containing the arsenite ions occurred earlier along the voltage axis than the solution containing no arsenite. This difference may indicate that the arsenite ions wrere reduced in this medium but that the polarographic wave was not formed because of the early reduction of the sodium ions present in the supporting electrolyte. This theory agrees with the work of Bayerle (2), who reported polarographic activity for arsenite ions in a sodium hydroxide solution.In the case of the lithium chloridelithium hydroxide electrolyte the lithium ions were not reduced until a potential of -2.1 volts had been reached as shown by curve C. This additional range permits full development of the arsenite wave.Logarithmic analysis of the polarographic curve indicated that it was irreversible. The same analysis indi-VOLTS (-]

Organic Polarography

“…The formation of the intermediate ketyl in the reduction of benzophenone has been demonstrated by large scale electrolysis in dimethylformamide (815), and by cyclic voltammetry in alkaline aqueous alcohol solutions (387). This intermediate has also been detected in photochemical reductions (72,73).…”

“…Other studies found that the peroxidic content of benzene extracts of corn was increased by ultrasonic vibrations (185) and that the peroxides in menhaden oil interfered in the estimation of iron (387). Sulfur Compounds.…”