Department of Environmental Sciences, Central University of Himachal Pradesh, Dharamshala, Himachal Pradesh, 176215, India.
Environ Sci Pollut Res Int. 2018 Aug;25(22):22294-22307. doi: 10.1007/s11356-018-2343-1. Epub 2018 May 28.
Metal pollution in soil is a serious problem among waste landfill sites and associated environment all over the globe. Amelioration of contaminated soil by plant bioaccumulation is an important strategy to protect the soil environment. Ageratum conyzoides is a common weed species that can grow easily in any contaminating site and bioaccumulate heavy metals present in the e-waste dumping/recycling sites as a natural scavenger. Soil selected for the study was contaminated with waste cathode ray tube (CRT) and printed circuit board (PCB) powder in the concentration range of 1-10 g/kg. Soil decontamination was achieved by using weed plants with ethylene diamine tetraacetic acid (EDTA, 0.1 g/kg) and kinetin (100 μM) combination in pot experiments. Fe, Mn, Zn, and Cu accumulation was found to be highest in leaves (6.51-38.58; 0.14-73.12; 5.24-269.07; 9.38-116.59%); Pb and Cr in stem (22.83-113.41; 21.05-500%), respectively, as compared with blank. Ion chromatography was used as a tool for the measurement of essential ions present in plant under different conditions. Plants showed better growth in terms of shoot, root length, biomass weight, and chlorophyll content with the proposed combination. EDTA allows the metals available for the accumulation through possible complexation. Also, the compatibility of kinetin to manage stress in plant is found to be enhanced in the presence of EDTA due to possible π-π interaction. Metal stress condition causes the deficiency of essential ions in the plants thereby disturbing its biochemistry and results in its eventual death. EDTA-kinetin hybrid treatment was found to be compatible for metal decontamination from soil, its detoxification in plants by changing its environment and restoring the essential ions for the survival of plant.
土壤中的金属污染是全球范围内垃圾填埋场和相关环境中的一个严重问题。通过植物生物累积来改善受污染的土壤是保护土壤环境的重要策略。青葙是一种常见的杂草物种，它可以在任何污染的地方生长，并作为一种天然的清道夫，在电子废物倾倒/回收地点积累存在的重金属。选择的土壤受到来自废旧阴极射线管（CRT）和印刷电路板（PCB）粉末的污染，浓度范围为 1-10 g/kg。在盆栽实验中，使用含有乙二胺四乙酸（EDTA，0.1 g/kg）和激动素（100 μM）的杂草植物组合来实现土壤脱污染。发现铁、锰、锌和铜在叶片中的积累量最高（6.51-38.58；0.14-73.12；5.24-269.07；9.38-116.59%）；铅和铬在茎中积累量分别为 22.83-113.41；21.05-500%），与空白相比。离子色谱法被用作在不同条件下测量植物中存在的必需离子的工具。与对照相比，拟议的组合使植物在茎长、根长、生物量重量和叶绿素含量方面表现出更好的生长。EDTA 允许金属通过可能的络合作用而被积累。此外，由于可能的π-π相互作用，在 EDTA 存在下，发现激动素对植物压力的管理兼容性增强。金属胁迫条件会导致植物中必需离子的缺乏，从而扰乱其生物化学过程，并最终导致其死亡。EDTA-激动素混合处理被发现对从土壤中脱除金属、在植物中解毒以及通过改变环境来恢复植物生存所需的必需离子是兼容的。
