前期共鳴ラマン効果を利用する微量芳香族ニトロ化合物の検出

概要

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The microanalytical application of preresonance Raman effect has been examined for nitrobenzene and some para-substituted nitrobenzenes {p-OH, p-NH_2, p-NHCH_3, p-N(CH_3)_2}. The wavelengths of the maximum absorptions of UV bands of the samples are from 260 nm to 395 nm, and the wavelength of the excitation laser line is 488.0 nm. Under this condition, the detection limits of the samples by Raman spectrometry have been determined, using the NO_2 symmetric stretching vibration band. Though, as is expected, the detection limit becomes lower in an orderly fashion as the wavelength of UV absorptions of samples approaches to that of the excitation source, it can roughly be said that it is about 10^<-6> M (from several hundreds to several tens ppb). This sensitivity is about two orders of magnitude lower, when compared with that for azo dye samples, for which the resonance condition is much more rigorous (the wavelength of the maximum absorption is about 500 nm). For all that, it can be concluded that the results obtained here give an useful guide in the microanalytical applications of Raman spectrometry to practical samples such as polycyclic aromatic nitrocompounds as air pollutants.
社団法人日本分析化学会の論文
1984-01-05