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Distribution and Mineralization of <sup>14</sup>C-Hexazinone in Soil Microcosm with the Riparian Forest Specie <em>Cecropia Hololeuca</em> | OMICS International | Abstract
ISSN: 2155-6199

Journal of Bioremediation & Biodegradation
Open Access

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Special Issue Article

Distribution and Mineralization of 14C-Hexazinone in Soil Microcosm with the Riparian Forest Specie Cecropia Hololeuca

Marinho DA1*, Bicalho ST2, Ferreira EM3 and Langenbach T3
1Postgraduation Program in Plant Biotechnology, CCS, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
2FATEC-ID, Induiutaba, S.P. Brazil
3Institute of Microbiology Professor Paulo de Góes, CCS, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
Corresponding Author : Marinho DA
Universidade Federal do Rio de Janeiro
CCS, Bloco I, Instituto de Microbiologia
sala 29 Cidade Universitária
CEP 21491-590, Rio de Janeiro, Rio de Janeiro, Brazil
E-mail: [email protected]
Received: Spetember 07, 2011; Accepted: November 29, 2011; Published: December 02, 2011
Citation: Marinho DA, Bicalho ST, Ferreira EM, Langenbach T (2011) Distribution and Mineralization of 14C-Hexazinone in Soil-Plant Microcosm with the Riparian Forest Specie Cecropia Hololeuca. J Bioremed Biodegrad S1:002. doi:10.4172/2155-6199.S1-002
Copyright: © 2011 Marinho DA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Although Brazil is one of the world’s largest consumers of the herbicide hexazinone there are few studies, in the country, on the fate of this compound in the environment. This work studied the distribution and mineralization of hexazinone in a microcosm, with and without plants. The herbicide 14C-hexazinone was applied to microcosms with soil and C. hololeuca seedlings and mineralization and volatilization was monitored over a two month period. After this incubation period, radioactivity was measured in different soil layers, the rhizosphere, as well as in parts of the plant: fine and thick roots, stems, and leaves. The results showed that evaporation promoted an upward movement of hexazinone to higher soil layers which was enhanced in the presence of plants, due to evapotranspiration. The mass balance showed an uptake of 12.2 % in plants, and the leaves had the highest bioaccumulation value (9.1%). Mineralization in the soil microcosm was low, about 0.6 % but with the presence of plants it increased to 1.15 % without increasing the CFU of hexazinone and lignin biodegrader fungi. Bioremediation of hexazinone by biodegradation and accumulation in plant biomass reduced its concentration in the soil slightly, showing that this molecule can have hazardous consequences for the environment.

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