Einfacher Feinnachweis von Schwefel in organischen Verbindungen

Abstract

Voluuien XXXII, E'ascirnlus I ( 1 949) -Xo. 32. Einfacher Feinnachweis yon Schwefel in organischenVerbindungen von G. Bussmann. (20. XII. 48.) 1) H . Schmalfuss und H . Barthmeyer, Microch. 8 , 247 (1930). 2) Foulke und Schneider, 1. c. 3, Bei sehr kleinen Mengen ist eine rohe Wagung auf der Mikrowaage zu empfehlen.

Dumas Microdetermination of Nitrogen in Refactory Organic Compounds. Modification of Zimmermann's Method

“…During the first combustion, C-2 is lowered as needed to avoid having excess pressure in the system (3). At the end of the second combustion, C-2 is lowered so that its mercury level is about 5 mm.…”

“…The dilution in the chamber allows the mixed gases to be driven through the combustion tube much faster (23) than is feasible in the conventional Dumas method. Equally important is the fact that a uniform rate of gas How through the combustion tube is readily maintained by this procedure (3). Although Zimmermann's method is a considerable improvement over other Dumas modifications, adherence to Pregl's way of mixing the sample with copper oxide and transferring it from a mixing tube to the combustion tube is objectionable, as several investigators have stated (13,18).…”

Pharmaceuticals and Natural Drugs

“…Identification tests for sulfur (37) in organic compounds are possible by' reducing the sample in a capillary tube with the aid of heat, anhydrous potassium carbonate, and powdered magnesium. The hydrogen sulfide evolved may be tested for with filter paper impregnated with 0.1 N lead acetate containing a few' drops of acetic acid.…”

Procedure for Collection of Isotopic Nitrogen

“…KNO, + NMI4CI -> KC1 + 2IUO + XL (2) intimate that the enrichment in the nitrogen produced from each reaction should be the same, within limits which may be considered satisfactory for a mechanism study, where the enrichment in the nitrite of Reaction 1 and of the ammonium of Reaction 2 is the same. Data for reactions of this nature are given in Table I, where the nitrite and ammonium ions have comparable enrichments.…”