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首页> 外文期刊>Environmental Science & Technology >Retention of Nonionic Organic Compounds on Thermally Treated Soils
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Retention of Nonionic Organic Compounds on Thermally Treated Soils

机译：非离子有机化合物在热处理土壤上的保留

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To achieve a higher efficiency of thermal remediation of soil contaminated with organic compounds, the retention mechanisms of organic compounds on thermally treated soil need to be understood adequately. In this study, a soil-column gas chromatography approach was developed to determine the soil-air partition coefficients (K_(SA)) at 300 ℃ for a diverse set of nonionic organic compounds bearing many different functional groups; and the retention mechanisms of these organic compounds on two typical soils, isohumisols and ferralisols, were characterized using a polyparameter linear free energy relationship (pp-LFER). The K_(SA) values (mL g~(-1)) of typical volatile organic compounds (VOCs) with lower boiling points were <1.5 and in some cases even below 1.0, suggesting the rapid removal of VOCs from soils at 300 ℃. Moreover, the K_(SA) values were found to be a strong function of the soil-column temperature T (K), and be almost independent of the carrier-gas flow rate. Significant differences in molecular interactions were noted among various soil-solute pairs. The relative contributions of nonspecific van der Waals forces to the retention of test polar solutes were higher on isohumisols than on ferralisols. In contrast to the reported pp-LFER models for natural soils and soil components at normal environmental temperatures, our results suggest that elevated temperature remarkably reduces H-bond interactions between polar organic compounds and the soil matrix, thus allowing accelerated desorption of polar organic compounds from soils during thermal treatment.
机译：为了获得较高的热效率，以热修复被有机化合物污染的土壤，需要充分了解有机化合物在热处理土壤上的保留机理。在这项研究中，开发了一种土壤柱气相色谱法，用于测定300℃下具有多种不同官能团的多种非离子有机化合物在土壤中的空气分配系数（K_（SA））。并使用多参数线性自由能关系（pp-LFER）表征了这些有机化合物在两种典型土壤（异水溶胶和亚铁多酚）中的保留机理。典型的低沸点挥发性有机化合物（VOC）的K_（SA）值（mL g〜（-1））小于1.5，在某些情况下甚至低于1.0，这表明300℃时土壤中VOC的快速去除。此外，发现K_（SA）值是土壤柱温T（K）的强函数，并且几乎与载气流速无关。在各种土壤-溶质对之间发现了分子相互作用的显着差异。非特异性范德华力对保留测试极性溶质的相对贡献在异黄酮醇上高于在Ferralisols上。与报道的在正常环境温度下天然土壤和土壤组分的pp-LFER模型相反，我们的结果表明，高温显着降低了极性有机化合物与土壤基质之间的氢键相互作用，从而加速了极性有机化合物从土壤中的解吸热处理过程中的土壤。

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  • 来源
    《Environmental Science & Technology》 |2010年第10期|P.3677-3682|共6页
  • 作者

    HAIJUN ZHANG; SUFANG ZHAO; YING YU; YUWEN NI; XIANBO LU; YUZENG TIAN; JIPING CHEN;

  • 作者单位

    Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;

    rnCollege of Environmental Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China National Marine Environmental Monitoring Center, 42 Linghe Street, Dalian 116023, China;

    rnCollege of Environmental Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China;

    rnDalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;

    rnDalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;

    rnDalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;

    rnDalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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