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Assessment of gamma radiolytic degradation in waste lubricating oil by GC/MS and UV/VIS

2009; Elsevier BV; Volume: 78; Issue: 7-8 Linguagem: Inglês

10.1016/j.radphyschem.2009.03.063

1879-0895

Marcos A. Scapin, C.L. Duarte, José Oscar William Vega Bustillos, I.M. Sato,

Nuclear Physics and Applications

The hydrocarbons degradation by gamma irradiation of the waste automotive lubricating oil at different absorbed doses has was investigated. The waste automotive oil in a Brazilian oil recycling company was collected. This sample was fractioned and 50% and 70% (v/v) Milli-Q water were added. Each sample was irradiated with 100, 200 and 500 kGy doses using a gamma source Co-60—GAMMACELL type, with 5×10 3 Ci total activity. Gas chromatography–mass spectrometry (GC/MS) was used to identify degraded organic compounds. The mass spectra were analyzed using the mass spectral library from NIST, installed in the spectrometer. The sample irradiated at 500 kGy dose with 70% (v/v) Milli-Q water addition formed eight degradation products , namely diethanolmethylamine (C 5 H 13 NO), diethyldiethylene glycol (C 8 H 18 O 3 ), 1-octyn-3-ol, 4-ethyl (C 10 H 18 O) and 1.4-pentanediamine, N1, N1-diethyl (C 9 H 22 N 2 ). The color changing of the waste lubricating oil , for different absorbed doses, was determined by UV/VIS spectrophotometer. The related sample showed the lowest absorbance value evidencing the formation of 2-ethoxyethyl ether (C 8 H 18 O 3 ) compound.