The effect of nutrient application and aeration on oil degradation in soil |
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| Affiliation: | 1. Applied Technology Group to Environmental Health, Faculty of Health Science, Catholic University of Murcia, Campus de Los Jerónimos, s/n. Guadalupe, 30107, Murcia, Spain;2. Sustainability and Quality Group of Fruit and Vegetable Products, Murcia Institute of Agri-Food Research and Development, C/Mayor s/n. La Alberca, 30150 Murcia, Spain;3. Department of Agricultural Chemistry, Geology and Pedology, Faculty of Chemistry, University of Murcia, Campus Universitario de Espinardo, 30100, Murcia, Spain;1. Epidemiology Branch, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC, USA;2. Department of Statistics, Colorado State University, Fort Collins, CO, USA;3. Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA;4. Biostatistics Branch, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC, USA |
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| 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 (NH4)2SO4 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 (NH4)2SO4 and/or nutrients after 4 weeks incubation. After 12 weeks, oil degradation was significantly higher (p = 0·05) in the (NH4)2SO4 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 (NH4)2SO4, but was enhanced significantly (p = 0·05) by the addition of (NH4)2SO4 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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