Potential of macrophytes for removing atrazine from aqueous solution

Planta Daninha

Universidade Federal de Minas Gerais, Montes Claros¹  Santos, C.L¹  Universidade Federal de Viçosa, Viçosa¹  Oliveira, J.A¹  Empresa Brasileira de Pesquisa Agropecuária, Sete Lagoas¹  Aguiar, R¹  Lizieri-Santos, C¹  Guimarães, F.P¹  Karam, D¹  Sant'anna-Santos, B.F¹  Silva, J.A.A¹ 

关键词: Azolla caroliniana;    Salvinia minima;    Lemna gibba;    herbicide;    bioremediation.;   

DOI  :  10.1590/S0100-83582011000500022

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

The potential of three macrophytes, Azolla caroliniana, Salvinia minima, and Lemna gibba was assessed in this study to select plants for use in environmental remediation contaminated with atrazine. Experiments were carried out in a greenhouse over six days in pots containing Hoagland 0.25 strength nutritive solution at the following atrazine concentrations: 0; 0.01; 0.1; 1.0; 10.0 mg L-1. Decrease in biomass accumulation was observed in the three macrophytes, as well as toxic effects evidenced by the symptomatology developed by the plants which caused their deaths. The chlorosis and necrosis allowed to observe in the plants the high sensitivity of the three species to the herbicide. Plants presented low potential for removal of atrazine in solution when exposed to low concentrations of the herbicide. However, at the 10.0 mg L-1 atrazine concentration, L. gibba and A. caroliniana showed potential to remove the herbicide from the solution (0.016 and 0.018 mg atrazine per fresh mass gram, respectively). This fact likely resulted from the processes of atrazine adsorption by the dead material. The percentage of atrazine removed from the solution by the plants decreased when the plants were exposed to high concentrations of the pollutant. Azolla caroliniana, S. minima, and L. gibba were not effective in removing the herbicide from solution. The use of these species to remedy aquatic environments was shown to be limited.

【 授权许可】

Unknown