Beiträge zur technischen Gasanalyse

Analysis of Gases by Absorption and Combustion

“…Combustion by explosion (2) has found wide application, but the sample must be carefully blended with oxygen to obtain complete combustion and to avoid error due to oxidation of nitrogen (23). Slow combustion over a heated platinum filament (52) is in common use but is somewhat hazardous, owing to the danger from possible explosive mixtures. In addition, it is difficult to maintain a constant filament temperature and to avoid incomplete combustion without danger of melting the platinum filament.…”

Determination of Carbon Monoxide in Air

“…The air under examination is brought in contact with palladium chloride and if carbon monoxide is present, the following reaction occurs: CO + PdCh + H2O = Pd + CO2 + 2HC1. Bóttger (8) was the first to use palladium chloride for the detection of carbon monoxide, and it has since been used by various workers, notably C. Winkler (12) and Brunck (4), for the quantitative determination of carbon monoxide. These latter authors were interested in the measurement of relatively high concentrations of carbon monoxide and calculated their results from the weight of metallic palladium formed in the above reaction.…”

Determination of Gaseous Hydrocarbons

“…IN THE analysis of gases containing only nitrogen and paraffinic hydrocarbons, the paraffin content is usuallydetermined by combustion analysis. Methods most commonly used for the combustion (4,7) require admixture of a portion of sample with a suitable excess of oxygen and passage of this mixture over a heated catalyst or filament to promote combustion. Such methods necessitate a source of oxygen of accurately known purity and errors may be introduced by contamination or inaccurate measurement of the oxy-gen used.…”

“…In view of the general ease with which conditions of digestion in semimicro and microprocedures can be controlled (12), it is possible that, as recently reported (7,11,12,17,18,21), these may yield more concordant results for nitrogen determinations by the Kjeldahl method and its modifications. It is desirable that further extended trials by the micromethod, using various types of compounds, be carried out with a view to verifying whether the period of afterboil following clearance that is necessary for completeness of conversion to ammoniacal nitrogen is not so rigid a factor in determining the accuracy of the results obtained as in the macromethods.…”