Immobilization of heavy metals in rhizosphere soils : formulation of phytostabilization technology
Immobilization of heavy metals in rhizosphere soils : formulation of phytostabilization technology
批准号:
21710077
负责人:
HASHIMOTO Yohey
金额:
$1.08万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Young Scientists (B)
财政年份:
2009
资助国家:
日本
项目状态:
已结题
起止时间:
2009 至 2010
中文摘要
制定成功的植物稳定化战略在靶场土壤中,了解重金属是如何固定在根际土壤中的分子水平是至关重要的。本研究的目的是调查i)如何改变铅形态的根际土壤中的各种植物,和ii)铅颗粒在根际土壤中的溶解度和随后对土壤生态系统的影响。采用扩展X射线吸收精细结构(EXAFS)光谱技术和化学提取法研究了5种不同植物根际土壤中铅的形态和溶解度。EXAFS分析表明,Pb主要以PbCO_3的形式存在,吸附在有机质上,吸附在成土水钠锰矿和/或水铁矿上。比较根际和非根际土壤的EXAFS谱,发现根际和非根际土壤的精细结构存在显著差异,表明根际过程对Pb的形态进行了改变。变性梯度凝胶电泳结果表明,污染土壤中的植物生长表现出富集细菌种群的现象,因为根际土壤中的总条带比对照土壤中的条带更亮。pH值在7左右的土壤中细菌多样性增加。
英文摘要
To formulate successful phytostabilization strategies in a shooting range soil, understanding how heavy metals are immobilized at the molecular level in the rhizosphere soil is critical. The objectives of this study were to investigate i) how Pb speciation was modified in the rhizosphere soils of various plant species, and ii) solubility of Pb pellet in rhizosphere and subsequent impacts on soil ecosystems. Lead (Pb) speciation and solubility in rhizosphere soils of five different plant species were investigated using extended X-ray absorption fine structure (EXAFS) spectroscopy and chemical extraction. The EXAFS analysis indicated that Pb occurred as PbCO_3, Pb sorbed to organic matter, and Pb sorbed to pedogenic birnessite and/or ferrihydrite in the bulk soil. Comparison of the EXAFS spectra between bulk and rhizosphere soils demonstrated notable differences in fine structure, indicating that Pb species had been modified by rhizosphere processes. Denatured gradient gel electrophoresis demonstrated that Plant growth in the contaminated soil appeared to enrich bacterial populations since the general band profile exhibited in the rhizosphere soil was brighter than the control soil. Bacterial diversity was enhanced in the soil with the pH value of~7.
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分子環境土壌学:ナノスケールでの土壌重金属の化学形態と微生物毒性の評価
分子环境土壤科学:纳米尺度土壤重金属化学形态和微生物毒性评价
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
[Hashimoto, Y., Tajima, K, Yamada, H., Sato, T., 橋本洋平, 橋本洋平]
通讯作者:
橋本洋平
DOI:
10.1016/j.chemosphere.2009.04.049
发表时间:
2009-07-01
期刊:
CHEMOSPHERE
影响因子:
8.8
作者:
[Hashimoto, Yohey, Takaoka, Masaki, Tanida, Hajime]
通讯作者:
Tanida, Hajime
Enhanced transformation of lead speciation in rhizosphere soils using phosphorus amendments and phytostabilization : XAFS spectroscopy investigation.
使用磷改良剂和植物稳定化增强根际土壤中铅形态的转化:XAFS 光谱研究。
DOI:
--
发表时间:
2011
期刊:
Journal of Environmental Quality. in press
影响因子:
--
作者:
[Hashimoto, Y., Takaoka, M., Shiota, K.]
通讯作者:
K.
Rhizosphere bacterial community PCR-DGGE profiles and metal speciation in shooting range soils
射击场土壤中根际细菌群落 PCR-DGGE 谱和金属形态
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
[Hashimoto, Y., Tajima, K, Yamada, H., Sato, T.]
通讯作者:
T.
X線吸収分光法(XAFS)による還元土壌の鉛・アンチモンの存在形態と植物吸収の関係解明
使用 X 射线吸收光谱 (XAFS) 阐明还原土壤中铅和锑的存在与植物吸收之间的关系
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
[橋本洋平, 山口紀子]
通讯作者:
山口紀子
共 17 条
Molecular speciation of silver nanoparticle for elucidating bioavailability to plants and macrofauna
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批准号:24658062
-
项目类别:Grant-in-Aid for Challenging Exploratory Research
-
资助金额:$2.58万
-
财政年份:2012
-
负责人:HASHIMOTO Yohey
-
依托单位:
Elucidation of metal immobilization mechanisms and toxcity by chemical amendments
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批准号:23681013
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项目类别:Grant-in-Aid for Young Scientists (A)
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资助金额:$5.08万
-
财政年份:2011
-
负责人:HASHIMOTO Yohey
-
依托单位:
Lead immobilization and microbial activity in rhizosphere soils
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批准号:19710064
-
项目类别:Grant-in-Aid for Young Scientists (B)
-
资助金额:$0.93万
-
财政年份:2007
-
负责人:HASHIMOTO Yohey
-
依托单位:
海外基金