Abstract
Recently, the investigations have focused on the study of aquatic macrophytes as promising candidates for pollutant uptake and biological indicators of heavy metals in aquatic systems. Macrophyte-based treatments such as constructed wetlands appear to be highly competitive among the existing secondary treatment methods. Vegetation is important components of constructed wetlands designed to treat metal contaminated water. Waste effluents are characterized by substantial variations in pH values, and may have different heavy metal ions at variety concentration range. In this study, the effects of pH (4.5–8.0), temperature (15–35°C) and concentration (0.1–10.0 mgPb/L) on the bioremoval capacity of duckweed Lemna minor were investigated. The amount of biomass obtained in study period on dry basis, the concentrations of Pb(II) in tissue and in medium, and net uptake of Pb(II) by Lemna have been determined in different conditions. The percentages of Pb(II) uptake ratios were calculated for each condition. It was found that bioaccumulated Pb(II) concentrations and the maximum percentage removal were obtained at pH 4.5 and at 30°C. It was found that the concentration of Pb(II) in the plant biomass gradually increased with increase in concentration of Pb(II) in culture medium, but opposite trend was observed for the percentage of Pb(II) uptake.
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