Effects of Natural Attenuation, Organic Amendments and Metal Toxicants on 2, 4-Dichlorophenoxyacetic Acid Dissipation Dynamics in Soil
International Journal of Science and Research (IJSR)

International Journal of Science and Research (IJSR)
www.ijsr.net | Open Access | Fully Refereed | Peer Reviewed International Journal

ISSN: 2319-7064

Research Paper | Biology | Nigeria | Volume 4 Issue 11, November 2015

Effects of Natural Attenuation, Organic Amendments and Metal Toxicants on 2, 4-Dichlorophenoxyacetic Acid Dissipation Dynamics in Soil

Henrietta C Ogbu, Raymond A Wuana, John O Igoli

The dissipation dynamics of the herbicide, 2, 4-dichlorophenoxyacetic acid (2, 4-D), in soil was studied under the influence of natural attenuation (NA), poultry manure (PM), swine manure (SM), urea (UR), and metal toxicants (Cd, Pb) in a laboratory microcosm. A sandy clay soil was characterized and used for the study. The effects of variables such as initial 2, 4-D concentration (0 500 mg/kg), level of amendment (0 30 %w/w), amendment blends (binary and ternary), Cd/Pb loadings (0 200 mg/kg) and incubation time (0 30 days) on 2, 4-D dissipation were investigated. In all the experiments, residual 2, 4-D was recovered by solvent extraction, followed by reaction with chromotropic acid reagent for color development and assayed by UV-Vis spectrophotometry at max 565 nm. 2, 4-D naturally attenuated in soil, however, addition of PM, SM or UR did enhance the extent and rate of degradation. Relative to NA, the degrading efficiencies, DE ( %) of the amendments increased with increase in incubation time and level of amendment, but did not necessarily depend on initial 2, 4-D concentration. Pseudo-first-order degradation constants (x10-2/day) decreased with herbicide load and increased with amendment level, with corresponding half-lives (day) decreasing and increasing, respectively. DE values indicated that apart from the binary PM + SM amendment blend, the single amendments (especially PM and UR) were more effective at 2, 4-D degradation in soil. The extent of 2, 4-D degradation was reduced at increasing Cd and Pb loads, furnishing relatively low DEs (< 50 %) for the amendments but more so in the presence of Cd).

Keywords: Biodegradation, 2, 4-dichlorophenoxyacetic acid, Natural attenuation, Poultry manure, Swine manure, Urea

Edition: Volume 4 Issue 11, November 2015

Pages: 437 - 444

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Henrietta C Ogbu, Raymond A Wuana, John O Igoli, "Effects of Natural Attenuation, Organic Amendments and Metal Toxicants on 2, 4-Dichlorophenoxyacetic Acid Dissipation Dynamics in Soil", International Journal of Science and Research (IJSR), https://www.ijsr.net/search_index_results_paperid.php?id=NOV151028, Volume 4 Issue 11, November 2015, 437 - 444

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