宽叶香蒲对六价铬的生物吸附：机制及重金属胁迫响应。
Biosorption of Cr (VI) by Typha angustifolia: mechanism and responses to heavy metal stress.
机构信息
Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China.
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, PR China.
出版信息
Bioresour Technol. 2014 May;160:89-92. doi: 10.1016/j.biortech.2014.01.022. Epub 2014 Jan 17.
In this study, Typha angustifolia was proven to have an excellent accumulation ability in high concentrations of wastewater solutions having Cr (VI) concentrations up to 30 mg L(-1) for 20 days (74% of removal efficiency). Synchrotron microfocus micro X-ray fluorescence (μ-XRF) mapping showed that the uptaken Cr was mainly enriched in the outer layer of the roots and a small portion of it was uniformly distributed in the fronds. The total proteins, soluble sugars, and malondialdehyde in T. angustifolia increased when the concentration of Cr (VI) increased from 9 to 30 mg L(-1). Transmission electron microscope (TEM) assay showed that no lignifications were observed when Cr was absorbed by T. angustifolia. It was concluded that T. angustifolia can uptake Cr by means of surface layer absorption and transportation, and alleviate stresses associated with the sorption of Cr (VI) by thickening of cell walls or secretion of chemical substances.
在这项研究中，已经证明香蒲在高达 30 毫克/升的高浓度含铬（VI）废水溶液中具有出色的积累能力，处理 20 天（去除效率为 74%）。同步辐射微聚焦微 X 射线荧光（μ-XRF）映射表明，吸收的铬主要富集在根的外层，一小部分均匀分布在叶片中。当 Cr（VI）浓度从 9 毫克/升增加到 30 毫克/升时，香蒲中的总蛋白质、可溶性糖和丙二醛含量增加。透射电子显微镜（TEM）检测表明，当 Cr 被香蒲吸收时，没有观察到木质化现象。因此可以得出结论，香蒲可以通过表面层的吸收和运输来吸收 Cr，并通过细胞壁的增厚或分泌化学物质来缓解与 Cr（VI）吸附相关的应激。
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