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Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering 2004

Transformation of fulvic substances in the rhizosphere during phytoremediation of used motor oil.

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Elena Dominguez-Rosado
John Pichtel

Ključne riječi

Sažetak

Changes in the chemical composition of fulvic acids in used oil-contaminated soils treated with different plant species and fertilization (fertilized, F; and nonfertilized, NF) were analyzed by Fourier-Transformed Infrared Spectroscopy (FTIR). Soil contaminated with 1.5% (w/w) used motor oil was seeded with sunflower (Helianthus annuus)/Indian mustard (Brassica juncea); soybean (Glycine max)/green bean (Phaseolus vulgaris); mixed grasses/maize (Zea mays); mixed clover (red clover, Trifolium pratense/ladino clover, T. repens); wheat (Triticum aestivum)/oats (Avena sativa); and control (no vegetation). FTIR of soil fulvic acids under plants at 150 days showed changes in functional groups compared with nonvegetated soil fulvic acids. Results indicate the incorporation of oily compounds and decomposition of others. Soybean/bean (NF), clover mix (NF), and wheat/oats (NF) showed new bands at 1800cm(-1) related to the presence of carbonyl groups, associated with microbially induced beta-oxidation of oily hydrocarbons. A new band at 2300-2270cm(-1) in sunflower/mustard (F and NF), soybean/beans (F and NF) and wheat/oats (NF) indicated the presence of N-based degradation products. Fertilizer treatment resulted in new bands at 1400-700 cm(-1) in soybean/bean and grass/maize. In contrast, clover mix fulvic acid experienced disappearance of aromatic bands at 885cm(-1) and in wheat/oats at 2276cm(-1) (aliphatic-N).

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