Figure 47. Pyrolysis mass spectra of single drops of unprepared water samples from the inlet and outlet process streams of aerobic and anaerobic sewage treatment

plants. Conditions: samples 5 pi ; Tc 610°C; E

el nitrates as evidenced by the high peak at m/z 30, the spectrum of the anaerobically treated sample shows a strong NH3 ' peak and an aliphatic signal at m/z 42. Obviously, the information obtainable from the water samples may be used to complement the results of the sludge analyses. Moreover, the water profiles might be used directly to judge the efficiency of the treatment procedure as well as the suitability of the treated water for different types of use. Other potential applications of profiling the organic (as well as some of the inorganic) compounds in water samples are the analysis of samples from streams and ponds for the presence of lignin sul-phonates and other non-volatile organic pollutants.

The application of Curie-point Py-MS to the characterisation of organic pollutants in air, by analysing trapped air particulates, has been reported by Voorhees et al. (ref. 192). Samples were collected on quartz filters and the exposed portions of these filters ground and suspended in methanol. An aliquot of this suspension was applied to the Curie-point wire for analysis. Particulates from several well characterised sources were collected and analysed, as shown in Figure 48. Particulates of unknown origin might be identified by comparing their Py-MS patterns with those of



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