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首页> 外文会议>Water Environment Federation 75th annual technical exhibition amp; conference (WEFTEC 2002) >PHYTOREMEDIATION OF FERRO- AND POTASSIUM CYANIDE IN GROUNDWATER
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PHYTOREMEDIATION OF FERRO- AND POTASSIUM CYANIDE IN GROUNDWATER

机译：地下水中铁氰化钾的植物修复

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A hydroponic uptake study with willow (Salix eriocephala) was conducted to demonstrate thernefficacy of cyanide phytoremediation. The uptake of 15N-labeled free cyanide and ferrocyanidernfrom solution was examined under conditions that maintained cyanide availability in solution.rnCyanide speciation and concentration in the hydroponic solution were monitored with time torndemonstrate the chemical stability of cyanide compounds. Cyanide uptake was monitoredrnthrough analysis of the plant root, stem, and leaf tissue samples for 15N and cyanide content.rnSorption to the root cell wall was also investigated to distinguish between biological uptake andrnphysical association with the cell wall.rnThe hydroponic solution and tissue results indicate uptake and assimilation of free cyanide andrnferrocyanide by willow plants. Over the 20-day experiment, free cyanide and ferrocyanide levelsrnin the hydroponic solutions decreased from initial values of > 9.0 mg to 0.56 and 7.41 mg as CN.rnPlant tissue results showed a significant increase in 15N relative to controls for both free cyanideandrnferrocyanide-exposed plants. Root, stem, and leaf 15N concentrations increased by 488, 115,rnand 102 mg/kg-FW as CN for KCN-exposed tissue and 114, 6.33, and 21.9 mg/kg-FW as CN forrnferrocyanide-exposed tissue relative to natural abundance levels. Analysis of caustic extractsrnfrom plant tissues showed a large discrepancy between the cyanide detected by analysis andrnpredicted based upon the 15N content. Only ferrocyanide-treated roots showed cyanide levelsrncomparable to the amount predicted by the 15N data with 128 mg/kg-FW as CN. Therndiscrepancy, larger for free cyanide compared with ferrocyanide, suggests that cyanide is beingrntaken into the plant and assimilated.
机译：进行了对柳树（Salix eriocephala）的水培吸收研究，以证明氰化物植物修复的功效。在保持溶液中氰化物可得性的条件下，检查了溶液中15N标记的游离氰化物和亚铁氰化氢的吸收。随时间监测氰化物的形态和水培溶液中的浓度，以证明氰化物的化学稳定性。通过分析植物的根，茎和叶组织样品中的15N和氰化物含量来监测氰化物的吸收.rn还研究了对根细胞壁的吸附以区分生物吸收和与细胞壁的物理结合.rn水培溶液和组织结果表明柳植物对游离氰化物和亚铁氰化物的吸收和同化作用。在20天的实验中，水培溶液中的游离氰化物和亚铁氰化物含量从最初的9.0 mg降低到0.56和7.41 mg，这是由于CN。植物组织结果显示，与暴露于游离氰化物和亚铁氰化物的植物的对照相比，其15 N显着增加。 。相对于自然丰度，根，茎和叶的15N浓度以KCN暴露的组织为基准，分别增加了488、115，rn和102 mg / kg-FW，以CN暴露于氰化铁的组织为114、6.33和21.9 mg / kg-FW水平。植物组织中苛性碱提取物的分析表明，通过分析检测到的氰化物与根据15N含量预测的氰化物之间存在较大差异。仅以亚铁氰化物处理的根表现出的氰化物水平可与15N数据预测的以CN为128 mg / kg-FW的水平相当。与氰化亚铁相比，游离氰化物的热分散更大，表明氰化物被带入植物并被同化。

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