Phytoextraction of cadmium from contaminated soils
2006
Hattori, H.(Akita Prefectural Univ. (Japan). Faculty of Bioresource Sciences) | Chiba, K. | Ueda, E. | Ito, H. | Ito, T. | Nakamura, S. | Chino, M.
To clean up soils contaminated with cadmium (Cd), the removal of Cd by using plants was tested in a pot experiment. The soils used in the experiment were alluvial soil and volcanic ash soil collected from fields contaminated with Cd. The Cd content extracted by 0.1M HCI was 0.70 and l0.9 mg kg-1 in alluvial soil and volcanic ash soil respectively. Powdered sulfur was added to the soils to decrease the soil pH. Brassica juncea, Brassica rapa. Helianthus annuus and Carthamus tinctorius were cultivated in each of the soils for 6 weeks. Helianthus annuus (sunflower) absorbed more Cd than the other species, and in alluvial soil, the amount absorbed was equivalent to 22% of Cd extractable by 0.1M HCl. These results suggest that the removal of Cd by plants from soils contaminated with Cd of low level is possible.
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