Eine neue Methode für die potentiometrische Bestimmung der Mercurisalze

Determination of Mercury in Presence of Halides- Rapid Amperometric Titration

“…These values are not in agreement with those of Spacu and Murgulescu (11), who report potentiometrically determined values of the solubility in 0.02M iodide of 1.05 X 10"W at 15°C…”

“…All of these methods presumably would be satisfactory in tie presence of halides and other such complex formers, but they use the gravimetric approach and, therefore, would be somewhat slow and tedious when many samples are to be determined. Spacu and coworkers have described a potentiometric (11) and a titrimetric method (10) for the determination of mercury based or: the use of bis(ethylenediamine)-copper(II) nitrate reagent.…”

Analytical chemistry

“…21 The metals which form insoluble pyridine thiocyanates may be determined indirectly by measuring the thiocyanate in the filtrate ; this may be effected potentiometrically 22 or by ordinary volumetric methods.23 The precipitation of mercury as [Cu en,][HgI,], which serves to separate this metal from members of the hydrogen sulphide and the ammonium sulphide may be followed potentiometrically. 25 The perchlorate and picrate of methylene-blue are soluble in chloroform; this property may be applied to the determination of methylene-blue and picric acid 26 and of potassium, after precipitation as perchlorate or picrate.27…”

“…This has been done for simple residue determinations on initial weights of substance varying from 2 t o lOy, with errors of about 0.2y0, using Emich's electro-magnetic micro-balance, and also electrical determinations of copper on similar small weights were made with the same accuracy. 25 Apparatus.-Advance in micro-methods depends largely on new devices and adaptations for small-scale apparatus. The number of these is so great that only a few can be mentioned.…”