Microdetermination of Carbon and Hydrogen

Microdetermination of Sulfur in Organic Compounds

“…Dithio-oxamide was introduced as an analytical reagent by Ray and R&y (3) in 1926 but its use has been limited because of interfering reactions which occur in the presence of such common metals as iron, manganese, cobalt, and nickel. Feigl and Kapulitzas (3) successfully employed capillary separations for eliminating interferences in spot test analyses and West (4) showed that malonic acid can be used as a sequestering agent for the elimination of interfering ions, permitting direct spot test detection of copper. The present investigation was undertaken to extend the latter studies to quantitative applications, particularly in the field of water analysis.…”

“…(3) Devarda, A., Chem. Ztg., 16, 1952 (1892). (4) Knecht, E., and Hibbert, E., "New Reduction Methods in Volumetric Analysis," London, Longmans, Green and Co., 1925. in organic compounds is considered essentially to be the conversion of "organic" sulfur to the sulfate ion. XX'et and dry combustion methods are employed in carrying out this oxidation and the final sulfate estimation may be volumetric or gravimetric (11,IS).…”

Rapid Micromethod for Determining Carbon and Hydrogen in Organic Compounds

“…The use of absorbent vessels for nitrogen oxides has been recommended by various authors (4, 13, 16, 19, 21), but Clark and Stillson (9) showed that this procedure is unreliable.…”

Organic Gravimetric Analysis

“…Conventional tube packing and absorption bulbs have been used, and improvement in results is attributed to close control of mechanical factors. Critical studies of sources of error in the carbon-hydrogen micromethod have considered oxygen purity, combustion tube filling, and combustion time (7). On the basis of tests on commercial oxygen it was concluded that a copper oxide preburner cannot safely be omitted from the system unless the oxygen is tested for impurities before use.…”