Quantitative Goldanalyse mit Äther

Abstract

Die vorstehende Mitteilung beschäftigt sich mit einem neuen Wege zur genauen Analyse der Goldlegierungen, und besonders der Münzen.

The Influence of Acidity Function and Water Concentration on the Rate of Hydrolysis of p-Nitrobenzophenone Diethylketal in Aqueous Ethanol

“…The spectra of the ketal and ketone are discussed in the experimental section. Data for a typical run and the corresponding k' values calculated by use of equation (2) are given in Table I, and a summary of all runs is given in 'Fable II. Those runs of Table II (the first three)…”

The Applications of Reaction Kinetics to Metallographic Problems.

“…(1) Gold: Although in previous work (17,21) reproducible catalytic data have been obtained with gold samples purified by Kriiss's reprecipitation method (see 21), for this investigation the gold was purified once more by ether extraction of chloride solutions according to Mylius (11). This preparation did not differ catalytically from the former; thus, the B and q data obtained can be considered as those of the pure element.…”

Extraction and Determination of Gold with Tetraphenylarsonium Chloride

“…Lenher and Kao (8) first reported the determination of gold by the extraction of the chloride complex. Mylius (5) had studied this extraction extensively, and it was reported that the extraction was not quantitative when the concentration of gold was low. All of these methods have a number of interferences which require prior separation, and in the case of methods depending upon formation of a colloid, the interferences are severe.…”