Degradation of polycyclic aromatic hydrocarbons (PAHs) in contaminated soils by Fenton's reagent: A multivariate evaluation of the importance of soil characteristics and PAH properties
Degradation of polycyclic aromatic hydrocarbons (PAHs) in contaminated soils by Fenton's reagent: A multivariate evaluation of the importance of soil characteristics and PAH properties
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DOI：
10.1016/j.jhazmat.2007.03.057
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发表时间：
2007-10-01
影响因子：
13.6
通讯作者：
Tysklind, Mats
中科院分区：
文献类型：
--
作者：
Jonsson, Sofia;Persson, Ylva;Tysklind, Mats
在这项研究中，我们调查了多环芳烃（PAHs）的化学降解性，从不同的污染场地的老化土壤样品的土壤特性和多环芳烃的物理化学性质的影响。使用多元统计工具，偏最小二乘预测潜在结构（PLS）的结果进行了评价。多环芳烃污染的土壤样品进行了表征（pH值，电导率，有机质含量，氧化物含量，颗粒大小，比表面积，和时间流逝，因为污染事件，即年龄），并进行相对温和的，浆相芬顿的反应条件。在一般情况下，低分子量的多环芳烃降解到更大的程度比大，高度疏水的变种。蒽、苯并（a）芘和芘比其他结构相似的多环芳烃更容易降解;这一效应归因于这些化合物对与羟基自由基反应的敏感性。有机质的存在和土壤比表面积与二环和三环多环芳烃的降解呈明显负相关，而有机质的降解量与五环或六环多环芳烃的降解呈正相关。这是由更大的多环芳烃，这是从有机物，因为它降解释放的可用性增强。我们的研究表明，多环芳烃的吸附是由土壤特性和单个多环芳烃的物理化学性质相结合的影响。多元统计工具在评估这些参数的相对重要性方面具有很大的潜力。(C)2007 Elsevier B. V.保留所有权利。
In this study, we investigated how the chemical degradability of polycyclic aromatic hydrocarbons (PAHs) in aged soil samples from various contaminated sites is influenced by soil characteristics and by PAH physico-chemical properties. The results were evaluated using the multivariate statistical tool, partial least squares projections to latent structures (PLS). The PAH-contaminated soil samples were characterised (by pH, conductivity, organic matter content, oxide content, particle size, specific surface area, and the time elapsed since the contamination events, i.e. age), and subjected to relatively mild, slurry-phase Fenton's reaction conditions. In general, low molecular weight PAHs were degraded to a greater extent than large, highly hydrophobic variants. Anthracene, benzo(a)pyrene, and pyrene were more susceptible to degradation than other, structurally similar, PAHs; an effect attributed to the known susceptibility of these compounds to reactions with hydroxyl radicals. The presence of organic matter and the specific surface area of the soil were clearly negatively correlated with the degradation of bi- and tri-cyclic PAHs, whereas the amount of degraded organic matter correlated positively with the degradation of PAHs with five or six fused rings. This was explained by enhanced availability of the larger PAHs, which were released from the organic matter as it degraded. Our study shows that sorption of PAHs is influenced by a combination of soil characteristics and physico-chemical properties of individual PAHs. Multivariate statistical tools have great potential for assessing the relative importance of these parameters. (C) 2007 Elsevier B.V. All rights reserved.