Abstract
Phytoremediation is a green remediation technology for clean-up contaminated soils. The effect of chelant addition including EDTA, DTPA, EDDS, and citric acid on phtoextraction of metals within different organic contents of soil into sunflower (Helianthus annuus), Chinese cabbage (Brassica campestris), cattail (Typha latifolia), and reed (Phragmitescommunis) was investigated in this pot experiment study. The application of 5 mmol/kg EDTA and DTPA had inhibitory effects on the growth of the plants, resulting in % reduction in biomass, respectively, compared with that in the control. However, the uptake of metal into tested plants and translocation to aerial plant parts was also demonstrated. The essential metals Cu and Zn uptake by sunflowers were significantly enhanced via citric acid addition. The other three chelants (EDTA, DTPA, and EDDS) did not improve the Cu and Zn root uptake nor above ground parts translocation compared to the control plant. The addition of 5 mmol/Kg citric acid achieved the maximum extent of phytoextraction.
Highlights
Copper and zinc contaminated soils resulting from irrigation polluted by swine wastewater are one of the major environmental problems in Taiwan [1]
The residual fraction did not exceed % of the total content for both examined metals. It appeared that the whole exchangeable fraction of Cu and the whole fraction bound to reducible species were completely mobilized with EDTA
The phytoremediation of soils contaminated with heavy metals is becoming popular due to its green characteristics and cost effective as well as energy efficient properties
Summary
Copper and zinc contaminated soils resulting from irrigation polluted by swine wastewater are one of the major environmental problems in Taiwan [1]. The contamination of soils with heavy metals is threatening human health and ecosystems. Practiced soil remediation approaches such as soil excavation and dumping, soil washing/flushing are generally costly and harmful to soil properties while these traditional methods may not be feasible to regions with limited landfill space. Phytoremediaton, the use of plants for extraction of heavy metals from contaminated soils, has been viewed as one of the green remediation approaches and drawn great attention due to its low energy consumption and high public acceptance [2]. Phytoremediaton is applicable for the contaminated sites having low to moderate levels of pollutants at shallow depths, feasible as a long term solution to the problem. Harvestable parts of the plants can be processed by drying and ashing to extract metals
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