There are more natural and more cost-effective alternatives to economically over costing physical and chemical remediation of polluted agricultural soils. Heavy metals that exert a significant toxicity on the organisms in the environment are one of the primary dangerous materials. In the elimination of heavy metal toxicity in the soils, phytoremediation method is used as a new technology. In this study, the usability of corn (Zea mays L.) in the phytoremediation of hexavalent chromium-contaminated soil. Moreover, the hyperaccumulator ability of the corn for Cr+6 heavy metal was evaluated. In order to increase the solubility of chromium heavy metal in the soil different amounts of chelator (EDTA) were applied to the soils. The study was conducted according to the random blocks experimental design under controlled conditions with totally 18 pots of 3 replicates of control and 5 different chelate doses (0, 10, 20, 40, 80 mmol/kg). The soils in the pots were incubated with 30 mg/kg Cr+6 as Chromium (VI) oxide (Sigma-Aldrich No: 232653) for 30 days. During the sowing of the corn seeds 150 mg/kg N, 100 mg/kgP2O5, and 125 mg/kg K2O were applied to the pots and watering was done when needed. After the harvest, the chromium contents of the root and stem were determined. The chromium in the stem of the control was 2.81 mg/kg, and it was 31.46 mg/kg in the stem of 80 mmol/kg EDTA application trial. This result was statistically significant at 5%. The chromium content of the root was 18.57 mmol/kg in the control condition while it was 34.95 mmol/kg in the root of the highest concentration of applied chelate. This study revealed that corn is a hyperaccumulator plant to be used in phytoremediation of the soils contaminated by Cr+6.

中文翻译：

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植物修复：利用玉米（Zea mays L.）消除六价铬重金属

除了对受污染的农业土壤进行物理和化学修复的经济成本过高之外，还有更多自然和更具成本效益的替代方法。对环境中的生物体具有显着毒性的重金属是主要的危险物质之一。在土壤重金属毒性的消除中，植物修复法被作为一项新技术应用。在这项研究中，玉米（Zea mays L.）在六价铬污染土壤的植物修复中的可用性。此外，还评估了玉米对 Cr+6 重金属的超富集能力。为了增加铬重金属在土壤中的溶解度，不同量的螯合剂 (EDTA) 被施用于土壤。该研究是在受控条件下根据随机区组实验设计进行的，总共 18 盆，3 个重复的对照和 5 个不同的螯合物剂量（0、10、20、40、80 mmol/kg）。盆中的土壤与 30 mg/kg Cr+6 的氧化铬 (VI)（Sigma-Aldrich 编号：232653）一起培养 30 天。在玉米种子播种期间，向盆中施用 150 mg/kg N、100 mg/kgP2O5 和 125 mg/kg K2O，并在需要时浇水。收获后，测定根和茎的铬含量。对照茎中铬为2.81 mg/kg，80 mmol/kg EDTA施用试验茎中铬为31.46 mg/kg。该结果在 5% 时具有统计显着性。对照条件下根的铬含量为18.57 mmol/kg，而为34。95 mmol/kg 在施用螯合物的最高浓度的根中。这项研究表明，玉米是一种超富集植物，可用于植物修复被 Cr+6 污染的土壤。