R. Prakash, S. Kumari, S. Kumari, A. Sangwan, Anoop Singh
Phytoextraction of heavy metals enhanced by using chelating agents was proposed as an effective approach to remove heavy metals from contaminated soil by use of hyper accumulator plants. The effects of application of chelating agents viz., Cyclohexane diamino tetraacetic acid (CDTA), Citric acid (CA), Diethylene triamine pentaacetic acid (DTPA), Nitrilo triacetic acid (NTA) @ 10 mmol kg−1 soil and FYM (at 3%) on the growth of Zea mays and its Pb uptake were investigated in sewage sludge un-amended and amended (at 3%) soil using the pot-culture experiments. Application of chelating agents decreased the dry matter yield of roots of Zea mays while, higher values of dry matter yield (8.86 g pot1) was observed in case of FYM sewage sludge amended soil at 80 days after sowing. FYM addition was found beneficial as compared to control (Pb180). Dry matter yield of shoots of Zea mays increased over control due to application of CDTA and FYM. The highest dry matter yield of shoot (63.29 g pot−1) was observed in CDTA with sewage sludge amended soil at 80 days after sowing. Whereas reverse trend was observed in NTA, CA and DTPA treated soils. Addition of sewage sludge at 3% on dry weight basis was found beneficial in improving the plant growth. Chelating agents enhanced the Pb uptake by both roots and shoots. The higher values of Pb uptake by roots (2.89 mg pot−1) and shoots (13.21 mg pot−1) was observed in CDTA treated soil after 80 days of sowing in sewage sludge amended soil as compared to un-amended soil. Application of CDTA was found more effective in enhancing the Pb uptake by Zea mays roots and shoots than any other chelating agents at both the growth stages. Concentration of Pb in root was higher than that of shoots. Maximum Pb concentration was observed in NTA treated soil in both roots and shoots compare with other chelating agents. The chelating agents were found useful in enhancing phytoextractability of Pb by Zea mays. Hence, marginally Pb contaminated soil may be remediated by adding chelating agents.
提出了利用螯合剂加强植物对重金属的提取，作为利用超蓄能器植物去除污染土壤中重金属的有效途径。通过盆栽试验，研究了在污水污泥未改性和改性(3%)土壤中施用螯合剂(环己烷二氨基四乙酸(CDTA)、柠檬酸(CA)、二乙烯三胺五乙酸(DTPA)、硝基三乙酸(NTA) @ 10 mmol kg - 1土壤和FYM(3%)对玉米生长和铅吸收的影响。施用螯合剂降低了玉米根系干物质产量，而FYM污水污泥改良土壤在播种后80 d的干物质产量较高(8.86 g pot1)。与对照组(Pb180)相比，添加FYM是有益的。施用CDTA和FYM后玉米茎部干物质产量明显高于对照。在播种后80 d，污泥改良土壤CDTA处理的地上部干物质产量最高(63.29 g - 1)。而NTA、CA和DTPA处理的土壤则呈现相反的趋势。在干重基础上添加3%的污泥有利于植物的生长。螯合剂促进了根和芽对铅的吸收。经CDTA处理的污泥改良土壤在播种80 d后，其根(2.89 mg pot - 1)和茎(13.21 mg pot - 1)对铅的吸收量均高于未改良土壤。CDTA在促进玉米根和芽对铅的吸收方面比其他螯合剂更有效。根中铅浓度高于茎中铅浓度。与其他螯合剂相比，NTA处理土壤的根和芽中Pb含量最高。研究发现，螯合剂可有效提高玉米对Pb的提取能力。因此，微量铅污染土壤可以通过添加螯合剂进行修复。
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