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Immobilization of mercury by nano-elemental selenium and the underlying mechanisms in hydroponic-cultured garlic plant
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-03-03 , DOI: 10.1039/c9en01294j
Jiating Zhao 1, 2, 3, 4, 5 , Xujun Liang 5, 6, 7, 8 , Nali Zhu 3, 9, 10, 11, 12 , Liming Wang 1, 2, 3, 4, 5 , Yunyun Li 5, 13, 14, 15 , Yu-Feng Li 1, 2, 3, 4, 5 , Lirong Zheng 1, 2, 3, 4, 5 , Zhiyong Zhang 1, 2, 3, 4, 5 , Yuxi Gao 1, 2, 3, 4, 5 , Zhifang Chai 1, 2, 3, 4, 5
Affiliation  

In mining areas, nano-sized elemental selenium (SeNPs), naturally produced through reduction of SeO32− by abiotic and biotic processes, usually co-exists with Hg in the environment. Little is known about the fate of SeNPs and how they affect the bioavailability and toxicity of Hg towards plants. In this study, the fate of SeNPs and Hg, and the effect of SeNPs on the mobilization of Hg in a hydroponic-cultured plant were investigated. It was found that SeNPs were less phytotoxic and had stronger capacity for Hg sequestration than SeO32−and SeO42−. Synchrotron radiation X-ray fluorescence (SR-XRF) and X-ray absorption near edge structure (XANES) spectroscopy revealed that SeNPs largely captured Hg2+via forming HgSe and HgSeNPs to prevent Hg2+ from entering the root stele, thus inhibiting translocation and accumulation of Hg in the aerial parts. Apart from immobilizing Hg, SeNPs also promoted the conversion of Hg2+ to less toxic RS–Hg–SR and R–Hg–R binding forms in plants. Meanwhile, a portion of SeNPs was transformed into SeMet stored as the nutrient Se source in plant tissues. This study provides insights into the reaction and fate of SeNPs and Hg in water-plant systems, which implies the significance of SeNPs in modulating the fate and toxicity of Hg in mining areas.

中文翻译:

水培大蒜植物中纳米元素硒固定汞及其潜在机理

在矿区,通过非生物和生物过程通过还原SeO 3 2-天然产生的纳米级元素硒(SeNP),通常与环境中的汞共存。关于SeNPs的命运以及它们如何影响汞对植物的生物利用度和毒性知之甚少。在这项研究中,研究了SeNPs和Hg的命运,以及SeNPs对水培植物中Hg的迁移的影响。已发现,SeNPs的植物毒性较小,并且与SeO 3 2−和SeO 4 2−相比具有更高的固存汞能力。同步辐射X射线荧光(SR-XRF)和近边缘结构X射线吸收(XANES)光谱显示,SeNPs大量捕获Hg 2+通过形成HgSe和HgSeNPs来防止Hg 2+进入根碑,从而抑制Hg在地上部分的移位和积累。除固定化汞外,SeNPs还促进植物中Hg 2+转化为毒性较小的RS–Hg–SR和R–Hg–R结合形式。同时,一部分SeNP被转化为SeMet,作为植物组织中的营养硒源存储。这项研究为水厂系统中SeNPs和Hg的反应和命运提供了见识,这暗示了SeNPs在调节矿区Hg的命运和毒性中的重要性。
更新日期:2020-04-24
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