Department of Biotechnology, Laboratory of Environmental Biotechnology, Rama Devi Women's University, Bhubaneswar, 022, Odisha, India; Department of Botany, Laboratory of Environmental Physiology, Utkal University, Bhubaneswar, 004, Odisha, India.
UGC Emeritus Professor, Department of Botany, Utkal University, Bhubaneswar, 004, Odisha, India.
Ecotoxicol Environ Saf. 2020 May;194:110399. doi: 10.1016/j.ecoenv.2020.110399. Epub 2020 Mar 5.
Release of huge quantities of toxic hexavalent chromium (Cr) owing to its widespread use in several industrial and mining activities is a major environmental concern in 21st century. The present in situ vegetation analysis at three study sites gives insight on Cr hyperaccumulation potentiality which evaluates the phytoremediation ability of abundant native weeds growing in and around the Cr contaminated effluent discharge site at South Kaliapani chromite mine area, Odisha, India. Moreover, the study measure the relative bioconcentration of chromium in different plant parts with analysis of uptake related phytoremediation indices viz. Bioconcentration factor (BCF), Transportation index (Ti), Translocation factor (TF) and Metal Extraction Ratio (MER) to assess hyperaccumulation potentiality. Vegetation study near mine effluent discharge site (Site-1) reported maximum abundance for Diectomis fastigiata (8.25) followed by Vernonia cinerea (7.6) with Ti values 56 and 657 respectively. In site-2 (uncultivated barren land near site-1), Croton sparsiflorus showed maximum abundance (6.7) followed by Tephrosia purpurea (5.8) with Ti values 95.2 and 87.8 respectively whereas Kyllinga monocephala reported maximum abundance (6.1) followed by Fern sps. (5.9) with Ti values 62.4 and 81.1 respectively in site-3 (a swampy land flooded with chemically treated mine waste effluent). The highest Cr concentrations was recorded in roots of Diectomis fastigiata (2371 mg/kg dry matter) and shoot of Vernonia cinerea (5500 mg/kg dry matter) indicating their Cr phytoremediation potential. Moreover, the study provides the early indicative tools for detecting native Cr hyperaccumulators growing in an in situ environment with an in situ phytoremediation perspective.
由于其在若干工业和采矿活动中的广泛应用，大量有毒六价铬（Cr）的释放是 21 世纪的主要环境关注点。目前在三个研究地点进行的现场植被分析深入了解了 Cr 超积累潜力，评估了在印度奥里萨邦南卡利亚帕尼铬矿区受 Cr 污染的废水排放点及其周围大量本地杂草的植物修复能力。此外，该研究还通过分析与吸收相关的植物修复指数，即生物浓缩系数（BCF）、运输指数（Ti）、转移因子（TF）和金属提取比（MER），测量不同植物部位对铬的相对浓缩，以评估超积累潜力。矿山废水排放点附近的植被研究（地点 1）报告了最高的 Diectomis fastigiata（8.25）和 Vernonia cinerea（7.6）的丰度，Ti 值分别为 56 和 657。在未开垦的荒地（地点 1 附近的地点 2），Croton sparsiflorus 的丰度最高（6.7），其次是 Tephrosia purpurea（5.8），Ti 值分别为 95.2 和 87.8，而 Kyllinga monocephala 的丰度最高（6.1），其次是 Fern sps.（5.9），Ti 值分别为 62.4 和 81.1。在一个被化学处理过的矿山废水淹没的沼泽地（地点 3），Cr 浓度最高，记录在 Diectomis fastigiata 的根部（2371 mg/kg 干物质）和 Vernonia cinerea 的茎部（5500 mg/kg 干物质），表明它们具有 Cr 植物修复潜力。此外，该研究提供了在原位环境中检测生长的本地 Cr 超积累植物的早期指示工具，具有原位植物修复的视角。
