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The abiotic transformation of nitroaromatic pesticides by Fe(II) and dissolved organic matter

Hakala, Jacqueline Alexandra
http://rave.ohiolink.edu/etdc/view?acc_num=osu1198087788

Abstract Details

2008, Doctor of Philosophy, Ohio State University, Geological Sciences.
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.
Yu-Ping Chin (Advisor)
142 p.
Redox; transformation; pore water; sediment; Fe(II); iron; dissolved organic matter; pentachloronitrobenzene; trifluralin; pendimethalin; nitroaromatic

Recommended Citations

Citations

  • Hakala, J. A. (2008). The abiotic transformation of nitroaromatic pesticides by Fe(II) and dissolved organic matter [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1198087788

    APA Style (7th edition)

  • Hakala, Jacqueline Alexandra. The abiotic transformation of nitroaromatic pesticides by Fe(II) and dissolved organic matter. 2008. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1198087788.

    MLA Style (8th edition)

  • Hakala, Jacqueline Alexandra. "The abiotic transformation of nitroaromatic pesticides by Fe(II) and dissolved organic matter." Doctoral dissertation, Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1198087788

    Chicago Manual of Style (17th edition)

osu1198087788
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© 2007, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.