Effect of input pathways and altitudes on spatial distribution of polycyclic aromatic hydrocarbons in background soils, the Tibetan Plateau

Environmental Science and Pollution Research International
Qiusheng HeKui Lin

Abstract

Limited data on the spatial distribution of polycyclic aromatic hydrocarbons (PAHs) in Tibetan soils have been reported. This study measured the concentrations of PAHs in background soils across Tibet including 44 surface soils (0-10 cm) and 14 subsurface soils (10-20 cm) and assessed the effect of input pathways and altitudes on spatial distribution of PAHs. The concentrations of 15 US EPA priority PAHs (∑15-PAHs, naphthalene excluded) in all surface soils ranged from 1.50 to 29.88 ng/g dry weight with a mean concentration of 6.09 ng/g. The levels of PAHs in soils from southeast of Tibet were higher than those from northwest, which might be attributed to both more local emission as a result of relative higher population density and contributions of long-range atmosphere transport (LRAT) processes from Indian subcontinent in the south and Sichuan in the east. For the northwest Tibet, the westerly wind originated from the western boundaries between India and Nepal but not local emission might play an important role in input of PAHs, since there were slight anthropogenic activities. A general decrease of ∑15-PAHs with depth suggested their atmospheric input, while surface runoff might also play an important role in input of PAHs ...Continue Reading

References

Mar 3, 2006·Environmental Science & Technology·Shanshan XuShu Tao
Oct 24, 2006·The Science of the Total Environment·Xiao-Ping WangYong Zhang
Jul 28, 2007·Environmental Pollution·Jana KlánováPetr Klán
Jan 17, 2012·Environmental Pollution·Marek Tobiszewski, Jacek Namieśnik

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