An Improved Method of Organic Microcombustion¹

Abstract

INDUSTRIAL AND ENGINEERING CHEMISTRY 173 bore any relation to crystal structure. Cobalt at room temperature can exist as a hexagonal and as a face-centered cubic crystal. The working temperature undoubtedly affects the structure to some extent. In Table I, where cobalt is promoted with 1 per cent of the metal oxide, the crystal structures of the metals are fairly well distributed, no type predominating in any section. Description of the structure

Microanalytical Determination of Carbon and Hydrogen

“…Blumer (4) and Flaschentráger (12) constructed tubes with side-arm exits which could be closed by movable glass stoppers. Mercury for a liquid seal was adopted by Kemmerer and Hallett (19) and improved by Cornwall (11). Friedrich describes two kinds of mechanically self-sealing tubes (14) All these absorption devices have been found of little advantage, as the difficulty of handling (wiping) such tubes increases, while on account of prevented temperature-pressure equalization no greater constancy is observable.…”

Rapid Micromethod for Determining Carbon and Hydrogen in Organic Compounds

“…Satisfactory results with higher rates of flow have been reported (20,24,30,34,38) for the macro and semimacromethod, but in the micromethod, Belcher and Spooner (4), and later Ingram (21), used 50 ml. per minute in the "empty tube" com-bustion method.…”

Handling and Weighing Absorbtion Tubes in Microdeterminations of Carbon and Hydrogen

“…The original absorption agents, calcium chloride and soda lime, have been almost entirely replaced now by magnesium perchlorate (8,10,12) and ascarite. The anhydrous granular magnesium perchlorate has almost double the moistureabsorbing capacity of the trihydrate salt and is the preferable form to use.…”

“…In an attempt to make it possible to close the tube to the atmosphere, tubes have been made, the ends of which could be closed by mercury seals (5,10), by hollow ground-glass stoppers (2, 6, 7), and by wires (4,18). A recent development has a special absorption tube, designed and described by Friedrich (8), in which a single stopcock closes both the entrance and the exit to the tube.…”