Recent Developments in Quantitative Organic Microanalysis

Rapid and Precise Carbon-Hydrogen Determination. Automatic Macrocombustion Apparatus

“…Subsequently Kirsten (8) reported that as many as 200 microanalyses could be performed with a single charge of manganese dioxide. Advantages claimed were high capacity and the fact that it could be used at room temperature.…”

Isotope Dilution-Static Combination Method for Organic Carbon in Submilligram Specimens

“…Unterzaucher (5) described a method for the determination of carbon and hydrogen in submilligram quantities of material based on the determination of oxygen in the water and carbon dioxide resulting from the combustion of the sample. Kirsten ( 4 ) has stated, however, that Unterzaucher's procedure adds the troubles of the oxygen determination to those of the carbon and hydrogen determination.…”

“…This, of course, became of greater importance as the tracer specimen weight used in a given combustion was decreased. This background effect was evaluated in the following manner: Let T refer to the tracer, whence the number of mole atoms of carbon-13 is given by: 0.2761 IFr(0.4576 -rf) 0.989 r\ -1.11 X 10~2 (7) C13 Wt Mi X nl X Tt rr + 1 Wc X 1.11 X 10-2 + 12.01 (4) Table I shows the application of Equation 7 to the experimental observations carried out on this tracer. The results clearly illustrate the statistical constancy and magnitude of the background effect encountered in this work.…”

Tritium Radioactivity Determination of Biological Materials by Rapid Dry Combustion Technique

“…wide and a 20-mm. thick pad of loosely matted silver wool placed in the reduced end of the combustion tube ( 2 ,9 ) .…”