Heavy metal uptake and translocation by Jatropha curcas L. in sawdust sludge contaminated soils

Heavy metal pollution in soil is one of the most important environmental problems throughout the world and heavy metals cause significant toxic effect on humans, animals, microorganisms and plants. An experiment was conducted in sawdust contaminated soils at glasshouse to determine the growth response, metal tolerance and phytoremediation potential of Jatropha curcas. The J. curcas seedlings were planted in the growth media: T0 (Control, 100% soil, clay), T1 (80% soil + 20% sawdust sludge), T2 (60% soil + 40% sawdust sludge), T3 (40% soil + 60% sawdust sludge), T4 (20% soil + 80% sawdust sludge) and T5 (100 % sawdust sludge). The seedlings showed the best growth performance in T2 treatment in terms of height, basal diameter and number of leaves. The highest plant biomass was recorded in T2 and the maximum reduction of copper, iron, lead and zinc was also found in this treatment. Copper, lead and zinc were highly concentrated in the roots while iron and aluminum concentrated both in roots and leaves. The Jatropha curcas found to have a high potential to accumulate high amounts of copper, iron, aluminum, lead and zinc in its roots, leaves and stems. Plant in control to medium contaminated soils showed maximum translocation factor. The species was able to tolerate and accumulate a high concentration of heavy metals. Being a biodiesel non-food plant, Jatropha curcas can be an ideal option to be grown for phytoremediation in multi-metal contaminated sites and to mitigate the soil pollution. Keywords: Heavy metal absorption, Jatropha curcas, sawdust contaminated soil, phytoremediation. Abbreviations: ANOVA- Analysis of variance, Al - Aluminum, BCF- Bioconcentration factor, C- Celsius, Cd - Cadmium, CECCation exchange capacity, Cr - Chromium, Cu - Copper, DMRT-Duncan's Multiple Test Range, HCl - Hydrochloric acid, Hg - Mercury, HNO3 - Nitric acid, Pb - Lead, USDA - United State Department of Agriculture and Zn - Zinc.

© Southern Cross Publisher May 2012. Provided by ProQuest LLC. All Rights Reserved.

The use of this website is subject to the following Terms of Use