The high resolution Fourier-transform chemiluminescence spectrum of the HS2 radical

The chemiluminescence spectrum of the HS2 radical has been recorded with a Fourier-transform spectrometer. The overview spectrum in the region 9000 cm-1 to 4000 cm-1 has been analysed and the vibrational parameters obtained are presented. In addition three of the bands, which have been recorded at high resolution, have been rotationally analysed and the results of the fit are presented. The results are discussed in the context of previous theoretical and experimental studies

Mass spectrometric characterization of naphthenic acids in environmental samples: a review

There is a growing need to develop mass spectrometric methods for the characterization of oil sands naphthenic acids (structural formulae described by CnH2n+zO2 where n is the number of carbon atoms and "z" is referred to as the "hydrogen deficiency" and is equal to zero, or is a negative, even integer) present in environmental samples. This interest stems from the need to better understand their contribution to the total acid number of oil sands acids; along with assessing their toxicity in aquatic environments. Negative-ion electrospray ionization has emerged as the analytical technique of choice. For infusion samples, matrix effects are particularly evident for quantification in, the presence of salts and coelutants. However such effects can be minimized for methods that employ chromatographic separation prior to mass spectrometry (MS) detection. There have been several advances for accurate identification of classes of naphthenic acid components that employ a range of MS hyphenated techniques. General trends measured for degradation of the NAs in the environment appear to be similar to those obtained with either low- or high-resolution MS. Future MS research will likely focus on (i) development of more reliable quantitative methods that use chromatography and internal standards, (ii) the utility of representative model naphthenic acids as surrogates for the complex NA mixtures, and (iii) development of congener-specific analysis of the principal toxic components. (C) 2008 Wiley Periodicals, Inc., Mass Spec Rev 28:121-134, 200