Use of amaranth (Amaranthus paniculatus) and Indian mustard (Brassica juncea) for phytoextraction of lead and copper from contaminated soil
2013
Rahman, M.M. (University of Malaya, Kuala Lumpur (Malaysia). Inst. of Biological Sciences) | Tan, P.J. (University of Malaya, Kuala Lumpur (Malaysia). Inst. of Biological Sciences) | Faruq, G. (University of Malaya, Kuala Lumpur (Malaysia). Inst. of Biological Sciences) | Sofian, A.M. | Rosli, H. | Boyee, A.N.
This study investigated the use of contaminated soils with nitrogen (N) fertilizer at rates of 0, 2 and 4 g m-2 on copper (Cu) and lead (Pb) uptake by Indian mustard and amaranth. Addition of N fertilizer acidified the contaminated soil and caused the pH decrease to 5.5-5.6 from an initial pH 6.9. Total Cu uptake (15.7-21.4 mg per kg) was appreciably higher than Pb uptake (12.7-16.9 mg per kg) in both plant species with N amended soil. Contaminated soil amended with N fertilizer displayed maximum shoot concentration of Pb (10.1-11.6 mg per kg) and Cu (11.6-14.3 mg per kg), being two to four folds higher relative to roots (2.6-5.7 mg per kg for Pb; 3.5-4.7 mg per kg for Cu). Amaranth removed appreciably higher Pb (39.8-42.0%) and Cu (28.6-30.6%) than Indian mustard (31.6-35.6% for Pb; 27.9-32.2% for Cu) from contaminated soils with the application of N fertilizer. Shoot and root concentration (SC/RC) ratio of Pb and Cu was 1.9-4.3 and 2.6-3.8, respectively in both plant species with application of N fertilizer. The results suggest that N fertilizer is an effective amendment for phytoextraction of Pb and Cu from contaminated soils.
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