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首页> 外文期刊>Environmental Science & Technology >Impact of vegetation on sedimentary organic matter composition and polycyclic aromatic hydrocarbon attenuation
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Impact of vegetation on sedimentary organic matter composition and polycyclic aromatic hydrocarbon attenuation

机译：植被对沉积有机质组成和多环芳烃衰减的影响

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Results from natural and engineered phytoremediation systems provide strong evidence that vegetated soils mitigate polycyclic aromatic hydrocarbon (PAH) contamination. However, the mechanisms by which PAH mitigation occurs and the impact of plant organic matter on PAH attenuation remain unclear. This study assessed the impact of plant organic matter on PAH attenuation in labile and refractory sediments fractions from a petroleum distillate waste pit that has naturally revegetated. Samples were collected in distinct zones of barren and vegetated areas to assess changes to organic matter composition and PAH content as vegetation colonized and became established in the waste pit. Sediments were fractionated into bulk sediment and humin fractions and analyzed for organic matter composition by isotope ratio mass spectrometry (delta(13)C), C-13 nuclear magnetic resonance (C-13 NMR), Delta(14)C AMS (accelerator mass spectrometry), and percent organic carbon (%TOC). Gas chromatography mass spectrometry (GC/ MS) of lipid extracts of SOM fractions provided data for PAH distribution histograms, compound weathering ratios, and alkylated and nonalkylated PAH concentrations. Inputs of biogenic plant carbon, PAH weathering, and declines in PAH concentrations are most evident for vegetated SOM fractions, particularly humin fractions. Sequestered PAH metabolites were also observed in vegetated humin. These results show that plant organic matter does impact PAH attenuation in both labile and refractory fractions of petroleum distillate waste.
机译：天然和工程植物修复系统的结果提供了有力的证据，表明植被土壤减轻了多环芳烃（PAH）的污染。但是，减轻PAH的机制以及植物有机物对PAH衰减的影响尚不清楚。这项研究评估了植物有机质对天然植被恢复的石油馏分废料坑中不稳定和难熔沉积物级分中PAH衰减的影响。在贫瘠和植被区的不同区域收集样品，以评估植被在垃圾坑中定殖并建立后有机物组成和PAH含量的变化。将沉积物分为大量的沉积物和腐殖质部分，并通过同位素比质谱法（δ（13）C），C-13核磁共振（C-13 NMR），Delta（14）C AMS（加速器质量）分析有机物成分光谱法）和有机碳百分比（％TOC）。 SOM馏分脂质提取物的气相色谱质谱（GC / MS）提供了PAH分布直方图，化合物耐候比以及烷基化和非烷基化PAH浓度的数据。对于植被中的SOM馏分，特别是腐殖质馏分，生物植物碳的输入，PAH的风化以及PAH浓度的下降最为明显。在植物性腐殖质中也观察到了隔离的PAH代谢产物。这些结果表明，植物有机物确实会影响石油馏分废料的不稳定和耐火成分中PAH的衰减。

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