Study on the enhancement effect of EDTA and oxalic acid on phytoremediation of Cr(VI) from soil using Datura stramonium L.

IF 6.2 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Cong Shi , Juan Lv , Ziying Pei , Haitao Wang , Na Chang , Xin Fang , Kefan Wang
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Abstract

This study investigated the enhancing effects of soil treatment with ethylene diamine tetraacetic acid (EDTA) and oxalic acid (OA) on the remediation of Cr(VI) contaminated soil by Datura stramonium L. A greenhouse pot experiment was conducted, where Cr(VI) contaminated soil was treated with 100 mg/kg Cr(VI) and varying concentrations of EDTA (5 and 10 mmol/kg) and OA (5 and 10 mmol/kg). The effects of these soil treatments on biomass, chlorophyll content, antioxidant enzyme activities, and Cr(VI) enrichment and translocation efficiency of D. stramonium were evaluated. The results showed that added OA to soil significantly increased the biomass and chlorophyll content of D. stramonium. The addition of 10 mmol/kg of OA to soil increased the plant biomass by 67.16 % and chlorophyll b content by 40.01 %. In addition, OA soil treatment significantly enhanced the activities of superoxide dismutase (SOD) by 6.36 %, peroxidase (POD) by 163.13 %, catalase (CAT) by 36.92 %, and ascorbate peroxidase (APX) by 32.12 %, which effectively alleviated the oxidative stress induced by Cr(VI). In contrast, soil treatment with a high concentration of EDTA (10 mmol/kg) significantly reduced plant biomass and chlorophyll content, although it increased the biological concentration factor (BCF) of the stem and leaf, as well as the translocation factor (TF). In conclusion, appropriate amounts of EDTA and OA added to soil can enhance the phytoremediation efficiency of D. stramonium grown in Cr(VI) contaminated soil, with OA added to soil being more effective than addition of EDTA. This study revealed the potential mechanisms of chelating agents EDTA and OA in enhancing the phytoremediation of Cr(VI) contaminated soil by D. stramonium, providing a scientific basis for further optimization of phytoremediation techniques.
利用曼陀罗(Datura stramonium L.)研究乙二胺四乙酸(EDTA)和草酸对土壤中六价铬植物修复的增强效应
本研究探讨了乙二胺四乙酸(EDTA)和草酸(OA)处理土壤对曼陀罗(Datura stramonium L.)修复六价铬污染土壤的增效作用。评估了这些土壤处理对 D. stramonium 的生物量、叶绿素含量、抗氧化酶活性、六价铬富集和转移效率的影响。结果表明,向土壤中添加 OA 能显著提高石蒜的生物量和叶绿素含量。在土壤中添加 10 mmol/kg OA,植物生物量增加了 67.16%,叶绿素 b 含量增加了 40.01%。此外,土壤中添加 OA 后,超氧化物歧化酶(SOD)活性提高了 6.36%,过氧化物酶(POD)活性提高了 163.13%,过氧化氢酶(CAT)活性提高了 36.92%,抗坏血酸过氧化物酶(APX)活性提高了 32.12%,有效缓解了六(六)铬诱导的氧化胁迫。相反,用高浓度乙二胺四乙酸(10 mmol/kg)处理土壤会显著降低植物的生物量和叶绿素含量,但会提高茎叶的生物浓缩因子(BCF)和易位因子(TF)。总之,在土壤中添加适量的乙二胺四乙酸(EDTA)和氧化亚氮(OA)可提高在六(Cr)污染土壤中生长的石蒜的植物修复效率,其中添加氧化亚氮比添加乙二胺四乙酸(EDTA)更有效。该研究揭示了螯合剂 EDTA 和 OA 在提高石蒜对六价铬污染土壤的植物修复能力方面的潜在机制,为进一步优化植物修复技术提供了科学依据。
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来源期刊
CiteScore
12.10
自引率
5.90%
发文量
1234
审稿时长
88 days
期刊介绍: Ecotoxicology and Environmental Safety is a multi-disciplinary journal that focuses on understanding the exposure and effects of environmental contamination on organisms including human health. The scope of the journal covers three main themes. The topics within these themes, indicated below, include (but are not limited to) the following: Ecotoxicology、Environmental Chemistry、Environmental Safety etc.
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