Purpose

This study was designed to evaluate the possible effects of some chelating agents on phytoremediation efficiency and plant growth parameters of Amaranthus caudatus L. and Tagetes patula L. in soils contaminated with lead.

Method

The plant species were grown in pots and treated with lead nitrate and in combination with 2.5, 2.0 and 2.5 mmol/kg of EDTA, SA and CA, respectively.

Results

The results showed that the highest accumulations of Pb (mg/kg) with 0.74 and 0.13 were found in the roots and stems of A. caudatus exposed to 400 mg/kg Pb containing EDTA and SA, respectively. Moreover, the highest accumulation of Pb in the roots and stems of T. patula with 0.87 and 1.5 mg/kg were observed in 400 mg/kg Pb- contaminated soil containing SA.

Conclusions

Although the results obtained showed that T. patula would have a better phytoextraction potential than A. caudatus, it should be noted that due to the Pb behavior in the soil and/or leaching of Pb from the soil columns during the irrigation period the low amounts of Pb absorption by the root and aerial parts of the plants compared to the added doses of Pb(NO₃)₂ solution to the soil samples, imply the studied plants haven’t the adequate potential for phytoextraction of Pb from contaminated soils.

中文翻译：

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几种螯合剂对铅污染土壤中苋和万寿菊植物修复效果的评价

目的

本研究旨在评估某些螯合剂对铅污染土壤中苋菜和Tagetes patula L.的植物修复效率和植物生长参数的可能影响。

方法

植物物种在盆中生长，并分别用硝酸铅和 2.5、2.0 和 2.5 mmol/kg 的 EDTA、SA 和 CA 组合处理。

结果

结果表明，暴露于含 EDTA 和 SA 的 400 mg/kg Pb的A. caudatus根和茎中 Pb (mg/kg) 的最高积累量分别为 0.74 和 0.13。此外，在含 SA 的 400 mg/kg Pb 污染土壤中观察到T. patula根和茎中 Pb 的最高积累量分别为 0.87 和 1.5 mg/kg。

结论

虽然获得的结果表明T. patula比A. caudatus具有更好的植物提取潜力，但应该注意的是，由于土壤中的 Pb 行为和/或灌溉期间土壤柱中 Pb 的浸出，少量的 Pb与向土壤样品中添加 Pb(NO ₃ ) ₂溶液的剂量相比，植物根部和地上部分对 Pb 的吸收表明所研究的植物没有足够的潜力从受污染的土壤中提取 Pb。