Phytoextraction of uranium from contaminated soil by Macleaya cordata before and after application of EDDS and CA
Phytoextraction of uranium from contaminated soil by Macleaya cordata before and after application of EDDS and CA
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施用 EDDS 和 CA 前后博落回从受污染土壤中植物提取铀
DOI：
10.1007/s11356-014-3803-x
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发表时间：
2015-04-01
影响因子：
5.8
通讯作者：
Wang, Yong-dong
中科院分区：
文献类型：
--
作者：
Li, Chang-wu;Hu, Nan;Wang, Yong-dong
本文首次报道了利用麦克利亚属植物从温室铀污染土壤中提取铀。结果表明，麦香草通过增加土壤溶解有机碳（DOC）来提高土壤溶液中铀的浓度。柠檬酸（CA）和[S，S]-乙二胺二丁二酸（EDDS）在1.0、2.5、5.0和10.0 mmol kg（-1）干重（DW）土壤中施用的改良试验表明，在相同施用量下，EDDS比CA更能提高地上部铀浓度。5.0 mmol kg(-1) EDDS和10.0 mmol kg(-1) CA对提高木参茎部铀浓度最适宜。除2.5 mmol kg（-1）施用量外，相同施用量下CA对铀溶解度的提高效果更好。施用不同剂量EDDS和CA后，地上部铀浓度与土壤溶液14 d内单盆栽平均铀浓度均呈极显著的线性相关(r(2) = 0.972, P < 0.01；r (2) = 0.948, P < 0.01)，说明铀的吸收依赖于可溶性铀浓度。Fe- u -DOC和Mn- u -DOC络合物可能是在施用CA后形成的。土壤溶液pH和土壤溶液中Fe、Mn、CA和DOC浓度被螯合物改变。
This is the first report on using Macleaya cordata for phytoextraction of uranium from the uranium contaminated soil in the greenhouse. Macleaya M. cordata was found to increase uranium concentration in the soil solution by increasing the dissolved organic carbon (DOC). The amendment experiments with citric acid (CA) and [S,S]-ethylenediamine disuccinic acid (EDDS) at the rates of 1.0, 2.5, 5.0, and 10.0 mmol kg(-1) dry weight (DW) soil showed that EDDS was more efficient to increase uranium concentration in the shoot than CA when they were applied at the same rate. The applications of 5.0 mmol kg(-1) EDDS and 10.0 mmol kg(-1) CA were most appropriate for increasing uranium concentrations in the shoot of M. cordata. CA was more efficient to increase the solubility of uranium at the same application rates except for 2.5 mmol kg(-1) application rate. There was a linear correlation between the uranium concentration in the shoot and the average uranium concentration of one planted pot during 14 days in soil solution after the application of different rates of EDDS and CA, respectively (r(2) = 0.972, P < 0.01; r (2) = 0.948, P < 0.01), indicating that uranium uptake was dependent on the soluble uranium concentration. The Fe-U-DOC and Mn-U-DOC complexes were probably formed after the application of CA. Soil solution pH and Fe, Mn, Ca, and DOC concentrations in soil solution were found to be changed by the chelates.