Abstract
A new method for the determination of nitrogen, hydrogen and halogen in organic compounds is described. It is based on flash combustion in a fast stream (100 ml/min) of an automatically generated gas mixture (CO2+20% O2). A sample placed in an aluminium capsule and mixed with about 20 mg of V2O5 is combusted in the presence of CO3O4 coated on porous silica. Rapid gravimetric methods for final determination of hydrogen and halogens and a volumetric method for nitrogen are used. The combustion process has been examined by a rapid photography technique, mass spectrometry and gas chromatography. From an extensive statistical analysis (about 300 analyses) of various compounds containing C, H, O, N, Br, Cl, I and S, the following precision is obtained:sN=0.03–0.15%;sH=0.09–0.14%;s=0.07–0.20% absolute. The automation of the final determination of nitrogen and hydrogen has been examined.
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