| Abstract
| - A method using HRGC ion trap MS/MS for measuringsimultaneously amino metabolites and the parent compounds, the nitro musks, an important group of organicfragrance components found in sewage sludges, wasdeveloped. The monoamino metabolites were synthesizedand characterized by 1H/13C NMR and mass spectroscopy. Among the nitro musks, musk ketone was the majorcompound, found at an average concentration of 5 μg/kgof dry mass (dm) whereas musk xylene was detected inonly one sample (30 μg/kg dm). Three amino metaboliteswere identified, namely, 1-tert-butyl-3,5-dimethyl-4-amino-2,6-dinitrobenzene, 1,1,3,3,5-pentamethyl-4-nitro-6-aminoindane, and 4-acetyl-1-tert-butyl-3,5-dimethyl-2-nitro-6-aminobenzene, the corresponding reductionproducts of the nitro musks xylene, moskene, and ketone.These metabolites were present in partly higher concentrations in the sludges than the corresponding nitro muskcompounds. Musk xylene and musk moskene were mainlyfound as their monoamino metabolites, underlining theimportance of anaerobic reduction processes in the sewage treatment plant.
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