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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Arsenic Uptake by Native Fern Species in Thailand: Effect of Chelating Agents on Hyperaccumulation of Arsenic by Pityrogramma calomelanos
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Arsenic Uptake by Native Fern Species in Thailand: Effect of Chelating Agents on Hyperaccumulation of Arsenic by Pityrogramma calomelanos

机译：泰国本地蕨类植物对砷的吸收：螯合剂对拟南芥（Pityrogramma calomelanos）砷过度富集的影响

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摘要

Nineteen native fern species collected from an area in Thailand with high arsenic concentration in soil and in ground water as a result of tin mining was screened for elevated arsenic concentration in fronds. Two species of fern were found to contain elevated arsenic in their fronds in nature: Pityrogramma calomelanos (108-1156 μg g~(-1) dried weight) and Pteris vittata (79 μg g~(-1) dried weight). Under hydroponic culture Pityrogramma calomelanos (a silver back fern) accumulated arsenic in its shoot at rate of 4616 μg g~(-1) (dried weight). The accumulation of arsenic in Pityrogramma calomelanos shoot doubled with the addition of an EDTA (Ethelenediamine tetraacetic acid) chelating agent. The highest accumulation occurred 6 weeks after exposure to 10 mg L~(-1) arsenic as disodium hydrogen arsenate. The addition of another chelating agent, DMSA (Dimercaptosuccinic acid), resulted in a 5-fold decrease in arsenic concentration in the Pityrogramma calomelanos shoot compared to control after 6 weeks of exposure to arsenic. The contrasting effect of the EDTA and DMSA chelating agent was attributed to the strong binding of the thiol group to arsenic ion. This study indicated that Pityrogramma calomelanos uptake and translocate arsenic in the form of arsenate and arsenite rather than the As-DMSA complex. Using phytoextraction efficiency calculations, it was determined that Pityrogramma calomelanos gave the highest arsenic phytoextraction efficiency at 6 weeks after exposure to arsenic in the EDTA treatment, with an efficiency of 77.8 mg As based on whole plant biomass.
机译：对从锡地区开采的土壤和地下水中砷浓度高的泰国地区收集的19种本地蕨类植物进行了筛选，以发现叶中砷的浓度升高。自然界中发现了两种蕨类植物中的砷含量较高：蕨菜炭疽菌（108-1156μgg〜（-1）干重）和凤尾蕨（79μgg〜（-1）干重）。在水培条件下，Paterogramma calomelanos（一种银背蕨）在其芽中积累了4616μgg〜（-1）（干重）的砷。加入EDTA（乙二胺四乙酸）螯合剂后，炭疽菌枝条中砷的积累增加了一倍。最高浓度的积累发生在暴露于10 mg L〜（-1）砷砷化氢二钠后6周。暴露于砷的6周后，与对照相比，添加另一种螯合剂DMSA（二巯基琥珀酸）可使炭疽杆菌枝条中的砷浓度降低5倍。 EDTA和DMSA螯合剂的对比作用归因于硫醇基团与砷离子的强结合。这项研究表明，炭疽菌吸收并以砷酸盐和亚砷酸盐而不是As-DMSA复合物的形式转移砷。使用植物提取效率计算，可以确定，在EDTA处理中，Paterogramma calomelanos在暴露于砷后6周时砷的植物提取效率最高，基于整个植物生物量的效率为77.8 mg As。

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