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Erschienen in: Environmental Earth Sciences 10/2020

01.05.2020 | Original Article

Desorption and bioaccessibility of high-molecular-weight PAHs in aged field soil and humin-like fraction from a coke plant

verfasst von: Dan Han, Lin Jiang, Maosheng Zhong, Ruihuan Zhang, Quankai Fu, Dan Zhang, Tianxiang Xia

Erschienen in: Environmental Earth Sciences | Ausgabe 10/2020

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Abstract

The distribution of the sixteen priority polycyclic aromatic hydrocarbons (PAHs) in different components of field aged soil was investigated. Furthermore, the desorption and bioaccessibility of high molecular weight (HMW) PAHs with five and six aromatic rings were explored using XAD-2 resin-assisted desorption assay due to their high carcinogenicity, and Fourier Transform Infrared Spectroscopy (FTIR) was used to uncover the functional groups controlling PAHs bioaccessibility. It was revealed that nearly 99% PAHs were retained in mineral and humin-like fractions (HU), and the percentages reserved by HU fraction increase as aromatic ring increase. The accumulated HMW PAHs desorbed during the 120 d desorption experiment were 34 ~ 44% in soil with particle diameter less than 0.2 mm (referred as bulk soil hereafter) while 32 ~ 46% in HU. The desorption kinetics can be regressed well using the two-compartment model, and the fast desorption rates for bulk soil and HU were on the order of 10–2 d−1, an order of magnitude higher than the corresponding slow desorption rates. The FTIR spectra revealed that de-ashing the raw HU may expose PAHs combined with hydrophobic groups inside the mineral-organic complex to the desorption system, resulting in an overestimation of the bioaccessibility.

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Metadaten
Titel
Desorption and bioaccessibility of high-molecular-weight PAHs in aged field soil and humin-like fraction from a coke plant
verfasst von
Dan Han
Lin Jiang
Maosheng Zhong
Ruihuan Zhang
Quankai Fu
Dan Zhang
Tianxiang Xia
Publikationsdatum
01.05.2020
Verlag
Springer Berlin Heidelberg
Erschienen in
Environmental Earth Sciences / Ausgabe 10/2020
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI
https://doi.org/10.1007/s12665-020-08989-2

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