Abstract
Oil degradation was determined in oil-polluted (1 or 2 ml of light Nigerian crude/20 g soil, equivalent to 5 and 10% pollution) soils treated with (NH 4) 2SO 4 and with nutrient elements with and without enhanced aeration. There was no significant difference in oil degradation in soils with and without enhanced aeration, nor in soils treated with and without (NH 4) 2SO 4 and/or nutrients after 4 weeks incubation. After 12 weeks, oil degradation was significantly higher ( p = 0·05) in the (NH 4) 2SO 4 and nutrient treated soils in comparison to the untreated soils, and in soils with enhanced aeration in comparison to the undisturbed soil, at the 5% oil pollution level. Warburg respirometer studies showed more oxygen consumption (significant at p = 0·05) in the polluted soils compared with the unpolluted soils. In oil-polluted soils oxygen consumption was depressed significantly ( p = 0·05) by the addition of (NH 4) 2SO 4, but was enhanced significantly ( p = 0·05) by the addition of (NH 4) 2SO 4 and nutrient elements. The respiratory quotient (RQ) was reduced from 0·81 in unpolluted soils to 0·62 in oil-polluted soils.
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