Aliphatic hydrocarbons recovered in vegetables from soils based on their in-situ distribution in various soil humus fractions using a successive extraction method

文献类型： 外文期刊

第一作者： Zhang, Juan

作者： Zhang, Juan;Zhang, Juan;Zhang, Ming-hua;Grieneisen, Michael L.;Fan, Shu-Kai;Zhang, Jian-feng

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关键词： Petroleum contaminants;Successive extraction;Soil humus;Uptake by vegetables;Behavior mechanisms

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2018 年 346 卷

页码：

收录情况： SCI

摘要： Aliphatic hydrocarbons (AHs) are major petroleum contaminants in the environment. In this study, the AHs bound to various soil endogenetic humus fractions were separated through successive extraction. Most of the AHs (46.1%) in soils were adsorbed onto/into humic acids (HA) and a small quantity of AHs (9.6%) were organic solvent extractable. AHs in B. chinensis were also analyzed since their potential risks to the residents through ingestion. AHs from C-21 to C-34, so called high molecular weight AHs (HMWAH5), were dominant AHs in B. chinensis (85.5%) and soils (70.4%), followed by AHs from C16 to C21, whose mobility can be enhanced via binding to fulvic acids and then can be taken up by plant root lipids (soil -plant pathway). HMWAHs were mainly HA -bound and then were detained in the top soil layers. HMWAH5 associated with fine topsoil particles could be transported to B. chinensis via the soil -air -plant pathway, including resuspension and aboveground plant cuticle capture. Results from Principal Component Analysis combined with Regression Analysis supported this assumption due to the positive correlations between HMWAHs concentration in B. chinensis and fine particle contents in soils. This work presents the distributions of petroleum contaminants that result from previously described behavior mechanisms. (C) 2017 Elsevier B.V. All rights reserved.

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