| .Fe3+对3种水生植物吸收不同形态砷的影响[J].农业环境科学学报,2013,32(6):. |
| Fe3+对3种水生植物吸收不同形态砷的影响 |
| The Uptake of Different Arsenic Forms in Three Aquatic Plants as Affected by Fe3+ |
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| DOI：10.11654/jaes.2013.06.005 |
| 中文关键词: 砷 Fe3+ 水生植物 砷形态 |
| 英文关键词: arsenic Fe3+ aquatic plants arsenic speciation |
| 基金项目: |
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| 摘要点击次数: 2853 |
| 全文下载次数: 2843 |
| 中文摘要: |
| Fe在As的生物地球化学循环中起着重要作用。采用室内水培法，运用色谱-原子荧光联用技术研究了在外源不同形态砷[亚砷酸盐As（Ⅲ）、砷酸盐As（V）和二甲基砷（DMA）]处理下，通过添加不同浓度Fe3+（0~2.0 mg·L-1）对黑藻（Hydrilla verticillata）、大薸（Pistia stratiotes）和凤眼莲（Eichhornia crassipes）3种水生植物生物量、总砷吸附量和吸收量的影响，重点考察了培养液中和植物体内砷形态的变化。结果表明,3种植物对各形态砷吸附较少，以吸收为主。Fe3+添加后，As（Ⅲ）培养下，大薸和凤眼莲体内的总砷含量显著增加；As（V）培养下，3种植物体内的总砷含量均显著增加；DMA培养下，3种植物体内的总砷含量均无显著变化。培养液砷形态分析结果显示，As（Ⅲ）培养下，10 d后3种植物培养液中的As（Ⅲ）均转化为As（V）；As（V）培养下，高浓度Fe3+显著减少了黑藻和凤眼莲培养液中As（V）的含量；DMA培养下，Fe3+显著减少凤眼莲培养液中DMA的含量。植物不同部位As形态分析结果显示，As（Ⅲ）或As（V）培养下，添加Fe3+后大薸根部As（V）和As（Ⅲ）含量均显著增加，凤眼莲根部仅As（V）含量显著增加；As（Ⅲ）培养下，添加Fe3+后大薸茎叶内As（Ⅲ）含量显著增加，凤眼莲茎叶内As（V）含量显著增加；As（V）培养下，添加Fe3+后黑藻茎叶内As（V）和As（Ⅲ）含量均显著增加，但大薸和凤眼莲茎叶仅As（Ⅲ）含量显著增加；DMA培养下，Fe3+的添加能显著增加凤眼莲根部的DMA含量，高浓度Fe3+（2 mg·L-1）添加能显著增加凤眼莲茎叶内DMA含量。因此，一定浓度的Fe3+能够增加植物对砷的吸收，在利用大型水生植物治理砷污染水体时，Fe3+的合理使用能增加植物修复的效果。 |
| 英文摘要: |
| Ferrous（Fe） plays an important role in the biogeochemical cycle of arsenic（As）. In the present research, the uptake of different As forms as affected by Fe3+ was investigate in three aquatic plants（Hydrilla verticillata, Pistia stratiotes and Eichhornia crassipes）. These plants were cultured using hydroponics. Chromatography hyphenated atomic fluorescence spectrophotometry was used to determine total arsenic contents and its speciation in the culture solution and plant body. The three plants were exposed to culture solution with different As forms（As（V）, As（Ⅲ） or DMA） and different Fe3+ concentrations（0~2 mg·L-1）. The plant biomass, total As adsorption and absorption were also evaluated. The results showed that As accumulation mainly occurred via biological uptake rather than physicochemical adsorption. Total As contents in P. stratiotes and E. crassipes exposed to As（Ⅲ） and in three plants exposed to As（V） increased with the addition of Fe3+. However, the total As contents in the three plants were not affected by Fe3+ addition at DMA treatment. Results from As speciation analysis in culture solution showed that after 10 days of incubation, As（Ⅲ） was transformed to As（V） at As（Ⅲ） treatment. As（V） concentrations in culture solution of H. verticillata or E. crassipes exposed to As（V） were decreased when high concentration of Fe3+ was added. DMA concentrations in the culture solution of E. crassipes exposed to DMA were also decreased with the addition of Fe3+. Results from As speciation analysis in plant parts（root and shoot） showed that root As（V） and As（Ⅲ） contents in P. stratiotes, and root As（V） contents in E. crassipes increased with the addition of Fe3+ at As（Ⅲ） or As（V） treatment. At As（Ⅲ） treatment, the shoot As（Ⅲ） contents in P. stratiotes, and the shoot As（V） contents in E. crassipes increased with the addition of Fe3+. At As（V） treatment, the shoot As（V） and As（Ⅲ） contents in H. verticillata, and the shoot As（Ⅲ） contents in P. stratiotes and E. crassipes increased with the addition of Fe3+. At DMA treatment, the DMA contents in the roots of E. crassipes increased with the addition of Fe3+. The DMA contents in the shoots of E. crassipes increased with the addition of high concentration of Fe3+（2 mg·L-1）. This work indicated that a suitable concentration of Fe3+ could increase As uptake of aquatic plants and improve the remediation efficiency of As-contaminated water. |
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