炎中のPO分子吸収スペクトルの研究

概要

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Molecular absorption spectrum of PO was observed for the first time in the flame using the usual type of atomic absorption spectrophotometer and the continuous H2 lamp as the source, when 1M aqueous solution of H3PO4 was aspirated into air-acetylene flame. This absorption spectrum shows γ system of PO near 2300Å, 2380Å, 2460Å and 2500Å, but the absorptions near 2595Å, and α and β systems, which was reported by emission spectrometry, were not observed. As the absorption band near 2460Å gives the largest absorbance of four bands, the line at 2460Å can be used for the determination of phosphorus. The absorption spectrum of PO gives the considerably high background, which may be due to the absorptions of P2O5 and other phosphorous compounds. Moreover, the interferences by some cations such as Na, K and Ca were observed, whereas there was no enhancement of absorption by addition of iso-propylalcohol, which was observed in flame emission. Detection limit was 2mg P/ml at 2460Å.