Sapienza University of Rome, Department of Environmental Biology, Rome, 000185, Italy.
Sapienza University of Rome, Department of Chemical Engineering Materials Environment, Rome, 00185, Italy.
Sci Rep. 2020 Feb 5;10(1):1920. doi: 10.1038/s41598-020-58639-7.
Contaminated water with hexavalent chromium Cr(VI) is a serious environmental problem. This study aimed to evaluate the Cr(VI) removal by zero valent iron nanoparticles (nZVI) reduction process and the impact of Cr(VI), nZVI and combined treatment with nZVI and Cr(VI) on tomato growth performance. To evaluate the Cr(VI) toxic effect on germination capability, seeds were exposed to increasing Cr(VI) concentrations up to 1000 mg L. The inhibition of seed germination and the decrease of hypocotyl and root length started from Cr(VI) 5 mg L. Under treatment with Cr(VI) + nZVI 5 mg L, seed germination, hypocotyl and root length resulted significantly higher compared to Cr(VI) 5 mg L treatment. The impact of only nZVI was investigated on chlorophyll and carotenoid in leaves; iron levels in leaves, roots, fruits and soil; carotenoid, fat-soluble vitamin and nicotianamine in mature fruits. A significant increase of leaf chlorophyll and carotenoids was observed after nZVI 5 mg L treatment compared to controls. No significant variations were observed in carotenoids, fat-soluble vitamins and nicotianamine levels after treatment with nZVI 5 mg L in mature fruits. For their ability to reduce Cr(VI) and to stimulate tomato growth, nZVI might to be considered as alternative for remediation purposes.
含六价铬 Cr(VI)的污染水是一个严重的环境问题。本研究旨在评估零价铁纳米颗粒 (nZVI)还原过程对 Cr(VI)的去除效果，以及 Cr(VI)、nZVI 及其与 Cr(VI)的联合处理对番茄生长性能的影响。为了评估 Cr(VI)对发芽能力的毒性作用，将种子暴露于高达 1000mg/L 的 Cr(VI)浓度下。种子发芽的抑制和下胚轴和根长的减少始于 5mg/L 的 Cr(VI)。在 Cr(VI)+nZVI 5mg/L 处理下，种子发芽、下胚轴和根长明显高于 Cr(VI) 5mg/L 处理。仅研究了 nZVI 对叶片中叶绿素和类胡萝卜素、叶片、根、果实和土壤中铁水平、成熟果实中类胡萝卜素、脂溶性维生素和烟碱胺的影响。与对照相比，nZVI 5mg/L 处理后叶片中叶绿素和类胡萝卜素显著增加。在成熟果实中用 nZVI 5mg/L 处理后，类胡萝卜素、脂溶性维生素和烟碱胺水平没有明显变化。由于 nZVI 具有还原 Cr(VI)和刺激番茄生长的能力，因此它可能被认为是修复的替代方法。
