Study of quenching of S2 emission by addition of oxygen to a hydrogen flame in molecular emission cavity analysis |
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| Authors: | Koichi Nakajima Takeo Takada |
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| Institution: | Faculty of Liberal Arts, Hosei University, 2-17-1 Fujimi, Chiyoda-ku, Tokyo 102 Japan;Department of Chemistry, College of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171 Japan |
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| Abstract: | Interferences of oxygen on S2 emission were measured for a hydrogen-oxgen flame in molecular emission cavity analysis and are discussed in terms of the emission intensities and temperatures in different regions of the flame. When a little oxygen is added to a hydrogen flame, S2 emission is usually quenched. It also brings about a reduction in temperature in the lower region of the flame, where a cavity is introduced. However, in a “lower burnt hydrogen-oxygen flame”, in which hydrogen reacts instantly with added oxygen at the burner top, S2 emission is not quenched by addition of oxygen, and the intensity and the flame temperature increase linearly with increasing oxygen flow-rate. Therefore, it is apparent that an increase in flame temperature is not responsible for the quenching. It is suggested that the existence of unburnt oxygen in the lower region of the flame can cause the quenching owing to the destruction of S2 molecules to form sulphur-oxygen compounds. |
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| Keywords: | Molecular emission cavity analysis Sulphur |
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