Disturbance response indicators of Impatiens walleriana exposed to benzene and chromium

Disturbance response indicators of Impatiens walleriana exposed to benzene and chromium

Author Campos, V. Google Scholar
Lessa, S. S. Google Scholar
Ramos, R. L. Autor UNIFESP Google Scholar
Shinzato, Mirian Chieko Autor UNIFESP Google Scholar
Medeiros, T. A. M. Google Scholar
Abstract The purpose of this study was to evaluate the remediation potential and disturbance response indicators of Impatiens walleriana exposed to benzene and chromium. Numerous studies over the years have found abundant evidence of the carcinogenicity of benzene and chromium (VI) in humans. Benzene and chromium are two toxic industrial chemicals commonly found together at contaminated sites, and one of the most common management strategies employed in the recovery of sites contaminated by petroleum products and trace metals is in situ remediation. Given that increasing interest has focused on the use of plants as depollution agents, direct injection tests and benzene misting were performed on I. walleriana to evaluate the remediation potential of this species. I. walleriana accumulated hexavalent chromium, mainly in the root system (164.23 mg kg(-1)), to the detriment of the aerial part (39.72 mg kg(-1)), and presented visible damage only at the highest concentration (30 mg L-1). Unlike chromium (VI), chromium (III) was retained almost entirely by the soil, leaving it available for removal by phytotechnology. However, after the contamination stopped, I. walleriana responded positively to the detoxification process, recovering its stem stiffness and leaf color. I. walleriana showed visible changes such as leaf chlorosis during the ten days of benzene contamination. When benzene is absorbed by the roots, it is translocated to and accumulated in the plant's aerial part. This mechanism the plant uses ensures its tolerance to the organic compound, enabling the species to survive and reproduce after treatment with benzene. Although I. walleriana accumulates minor amounts of hexavalent chromium in the aerial part, this amount suffices to induce greater oxidative stress and to increase the amount of hydrogen peroxide when compared to that of benzene. It was therefore concluded that I. walleriana is a species that possesses desirable characteristics for phytotechnology.
Keywords Impatiens walleriana
benzene
chromium
soil-plant interface
phytoremediation potential
xmlui.dri2xhtml.METS-1.0.item-coverage Philadelphia
Language English
Sponsor Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number CNPq: 470012/2012-9
Date 2017
Published in International Journal Of Phytoremediation. Philadelphia, v. 19, n. 8, p. 709-717, 2017.
ISSN 1522-6514 (Sherpa/Romeo, impact factor)
Publisher Taylor & Francis Inc
Extent 709-717
Origin http://dx.doi.org/10.1080/15226514.2017.1284745
Access rights Closed access
Type Article
Web of Science ID WOS:000402041800003
URI https://repositorio.unifesp.br/handle/11600/56284

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