Abstract
The tailing ponds of lead-zinc mines are artificial environment pollution sources, and also important dangerous sources of heavy metal contamination in lead-zinc mining areas. To study the effects of Ethylene Diamine Tetracetic Acid (EDTA) and Diethylene Triamine Penlaacetic Acid (DTPA) on phytoremediation of lead-zinc mining area soil, two chelators (EDTA and DTPA) were used in enrichment plant ryegrass to improve the uptake of Pb and Zn from soil. The results showed that when the doses of 0, 0.5, 1 and 2 mmol/kg EDTA and DTPA were used, the biomass of ryegrass (Lolium multiflorum Lam.) and its nutrient (N, P, K, Ca and Mg) content increased, whereas EDTA and DTPA with a dose of 4 mmol/kg decreased the biomass of ryegrass and its nutrient (N, P, K, Ca and Mg) content. EDTA and DTPA significantly enhanced the contents of Zn and Pb in ryegrass as compared with the control. As for Pb, the content of Pb in root and shoot reached a maximum of 2730.54 and 2484.42 mg/kg respectively when the dose of EDTA and DTPA was 2 mmol/kg. In the case of Zn, the content of Zn in root and shoot reached a maximum of 2428.37 and 2010.43 mg/kg respectively. The total Pb and Zn accumulations and translocation ratio in ryegrass had also been enhanced. The results indicated that EDTA and DTPA had great potential to be used for ryegrass to remedy Pb and Zn contamination soil of lead-zinc mining area, but should be used cautiously because of their environmental risks.
Highlights
With the development of lead-zinc mineral resources, heavy metals were released and transferred into the ecological environment [1], which caused serious environmental problems
The results showed that when the doses of 0, 0.5, 1 and 2 mmol/kg Ethylene Diamine Tetracetic Acid (EDTA) and Diethylene Triamine Penlaacetic Acid (DTPA) were used, the biomass of ryegrass (Lolium multiflorum Lam.) and its nutrient (N, P, K, Ca and Mg) content increased, whereas EDTA and DTPA with a dose of 4 mmol/kg decreased the biomass of ryegrass and its nutrient (N, P, K, Ca and Mg) content
This study found that EDTA and DTPA enhanced the contents of Pb/Zn in root and shoot of ryegrass plant, which was consistent with the research of Wang [34], and increased total Pb/Zn accumulation and translocation ratio in ryegrass plant
Summary
With the development of lead-zinc mineral resources, heavy metals were released and transferred into the ecological environment [1], which caused serious environmental problems. The contents of organic matter, nitrogen and phosphorus in the soil around the mine tailing area were reduced to levels that were 20% - 30% of those found in normal conditions [2,3]. It was urgent to apply ecological remediation methods in the lead-zinc mining area. The use of hyperaccumulator species in continuous phytoextraction processes is limited by the low bioavailability of pollutants to the root uptake [6]. Some studies found that the application of chelating agents showed positive effects on increasing the solubility of heavy metals in soil, thereby enhancing phytoextraction [7,8,9], and enhancing the amount of bioavailable
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