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The abiotic transformation of nitroaromatic pesticides by Fe(II) and dissolved organic matter
| Title: | The abiotic transformation of nitroaromatic pesticides by Fe(II) and dissolved organic matter |
| Author: | Hakala, Jacqueline Alexandra |
| Description: | Nitroaromatic pesticides are hydrophobic contaminants that can accumulate in sediments by the deposition of suspended solids from surface waters. Fe(II) and dissolved organic matter (DOM), present in suboxic and anoxic zones of freshwater sediments, can transform nitroaromatic pesticides in natural systems. In this study, the abiotic chemical transformation of pentachloronitrobenzene, trifluralin and pendimethalin was studied in controlled laboratory systems containing Fe(II) and fulvic acid DOM isolates, and in natural pore waters collected from a freshwater wetland. Geochemical parameters affecting reactivity in the natural wetland were also monitored. This study is the first to investigate nitroaromatic pesticide reduction in the presence of Fe(II) and DOM surface water isolates, and in natural benthic pore waters that contain high concentrations of dissolved Fe(II) and DOM. Although pentachloronitrobenzene, trifluralin and pendimethalin were reduced both in controlled systems and natural pore waters, reduction in unaltered pore waters was roughly an order of magnitude slower than in systems containing Fe(II) and fulvic acid isolates. These data show that controlled systems over-estimate nitroaromatic pesticide reactivity in natural systems, and also suggest that Fe(II) is naturally complexed to Fe(II)-stabilizing ligands in anoxic environments. Future work is necessary to elucidate the speciation of Fe(II) complexes present in natural anoxic environments. |
| Permanent Link: |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1198087788
http://hdl.handle.net/2374.OX/7598 |
| Date: | 2008 |
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