Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 136, Issue 2, Pages 371-378Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2005.12.025
Keywords
fly ash; metals; DTPA; CaCl2; NH4NO3; Brassica juncea
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A pot experiment was carried out to study the potential of the plant of Brassica juncea for the phytoextraction of metal from fly ash amended soil and to study correlation between different pool of metals (total, DTPA, CaCl2 and NH4NO3) and metal accumulated in the plant in order to assess better extractant for plant available metals. The results of total metal analysis in the soil revealed the presence of Cr, which was found below detection limit (BDC) in the plants. The fly ash (FA) amendments and soil samples were extracted with different extractants and the level of metal vary from one extractant to another. The regression analysis between total and extractable metals showed better regression for all the tested metals except Mn (R-2 =0.001) in DTPA extraction. Correlation coefficient between metal accumulation by the plant tissues and different pool of metals showed better correlation with DTPA in case of Fe, Zn and Ni, whereas, Cu was significantly correlated with NH4NO3 and other metals (Pb, Mn) with CaCl2. The soil analysis results revealed that the mobility and plant availability of metals (Fe, Mn, Zn, Ni) within the profiles of amended soils was influenced by the change in pH, however, Ph and Cu was not affected. The metal accumulation in total plant tissues was found in the order of Fe > Ni > Zn > Mn > Cu > Ph and its translocation was found more in upper part. The plants grown on soil amended with 25%FA have shown significant increase in plant biomass, shoot and plant height, whereas, no significant effect was observed in root length. The cluster analysis showed 10%FA behave differently on the basis of physico-chemical properties and metal behavior. Thus, it may be concluded that B. juncea can be used for phytoextraction of metals, especially Ni in fly ash amendment soil. (c) 2005 Elsevier B.V. All rights reserved.
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