Polarographische Untersuchungen auf dem Fettgebiet II: Die elektrometrische Bestimmung der Jodzahl

Abstract

Die Polarographie des freien Broms in mit Natriumbromid gesattigtem Methanol wird beschrieben. Uiiter Benutzung der Bromlosung nacfi Kaufrnann mit entspredwnd herabgesetztem Brom-Gehalt wurden eine polarographische und eine amperometrisme Mikromethode zur Bestimmung der Jodzahl entwidrelt. Die hierbei erhaltenen Ergebnisse sollen fur die coulometris&e JZ-Bestimniung herangezogen werden. Die Versucfistednik ist auch zur zeitlichen Verfolgung der Brom-Addition an unyesattigte Fettsauren geeignet.Polarographic Studies in the Fat-field 11: Electrometrlc determination of Iodine-Value Polarography of free bromine in methanol, saturated with sodium bromide, is described. Using the bromine solution of Kaufmann with correspondingly diminished bromine-content, a polarographic and an amperometric micro-method for determination of the iodine-value have been developed. The results obtained will be used for the coulometric determination of the iodine-value. The method applied can also be used to study the bromine-addition to unsaturated fatty acids in relation to time.

Organic Polarography

“…In other work the reliability of the determination of dehydroascorbic acid in canned fcods is questioned (345), and the disappearance of ascorbic acid in air has been followed at a vibrating platinum electrode (3i)4)• UnsaturaLed acids and their derivatives have been studied rather intensely. They have been determined indirectly by titrating with bromine and following the reaction polarographically (19). Direct reduction is used for sorbic acid (127), esters of azulene 1-carboxylic acid, and azulene dicarboxylic acids (484).…”