NDLI: Compositional fractionation of polyaromatic hydrocarbons in the karst soils, South China

Content Provider	Springer Nature Link
Author	Wang, Yinghui Xue, Rui Li, Jie Zhu, Hongxiang Xu, Yiyin Xue, Baoming Qi, Shihua Yuan, Daoxian Theodore, Oramah I.
Copyright Year	2011
Abstract	This study aims to explore the condensation and fractionation trends of persistent organic pollutants (POPs) in the karst soils. The tiankeng is a karst surface expression that can act as a focal point for introduction of contaminants to a karst aquifer, which may serve both as condenser for vapor phase POPs and as barrier/sink for particulate associated less volatile POPs. The fractionation of POPs in soils from the upper rim and floor of tiankeng is of interest in understanding the role of tiankeng in the long-distance transport of POPs. In the present study, polycyclic aromatic hydrocarbons (PAHs) in the surface soils from the upper rim and floor of Dashiwei tiankeng in Southern China were analyzed. The total PAH concentrations in soils were 23.40–190 ng g$^{−1}$, with phenanthrene being the most abundant. The distribution patterns of PAH compounds in the soil samples matched well with their properties. It indicated the heavy PAHs were susceptible to retention by the floor soils of tiankeng than light PAHs. A plot of Cfloor/Crim against PAH molecular weight gave a good positive relationship in the molecular weight range of 152–276. It is suggested that the floor soils can be focal points of more concentrated PAH and deserve attention. The concentrations of total PAHs in the floor soils (43.40–190 ng g$^{−1}$, mean 87.76 ng g$^{−1}$) were higher than those in the upper rim (23.40–88.94 ng g$^{−1}$, mean 57.74 ng g$^{−1}$). In addition, there was a shift in compound pattern with an increase in the proportion of light PAHs (2–3 rings), a decrease in heavy PAHs (5–6 rings) and a relatively stable content of 4-ring PAHs. A combination of particulate scavenging and cold condensation is proposed as the major mechanism for the compositional fractionation of PAHs in the soils from the upper rim and floor of tiankeng.
Starting Page	2013
Ending Page	2019
Page Count	7
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	66
Issue Number	7
e-ISSN	18666299
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-10-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Karst soil PAHs Deposition Fractionation Southern China Geology
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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