Phytoextraction of Arsenic from Soil byLeersia Oryzoides
- 1 March 2007
- journal article
- research article
- Published by Taylor & Francis Ltd in International Journal of Phytoremediation
- Vol. 9 (1), 31-40
- https://doi.org/10.1080/15226510601139383
Abstract
The potential of Leersia oryzoides (rice-cut grass) to remediate arsenic-contaminated soil was studied in greenhouse pot experiments. Leersia oryzoides grown in soil amended with arsenic to a concentration of 110 mg kg−1, extracted up to 305 mg kg−1 and 272 mg kg−1 arsenic into its shoots and roots, respectively, giving a shoot:root quotient of 1.12 and phytoextraction coefficients up to 2.8. Plants in the arsenic-amended soil showed visible signs of stress in the first 8 wk of growth, but then recovered. Based on the 132 plants that were grown in a surface area of approximately 180 cm2, the calculated total arsenic taken up by shoots is 120, 130, and 130 g ha−1 at 6, 10, and 16 wk, respectively, suggesting that additional arsenic could be removed by periodic mowing over a growing season. Extraction with a mixture of nitric acid and hydrogen peroxide indicated that the available arsenic was constant after the first 6 wk. Uptake is comparable to that reported for duckweed (Lemna gibba L.) and overlaps the low end of the values reported for Chinese brake fern (Pteris Vittata L.)Keywords
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