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Sci Total Environ. 2014 Feb 15;472:309-15. doi: 10.1016/j.scitotenv.2013.11.061. Epub 2013 Nov 30.

Persistent organic pollutants in soil near the Changwengluozha glacier of the Central Tibetan Plateau, China: their sorption to clays and implication.

Author information

1
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China; School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China. Electronic address: yuangl@cugb.edu.cn.
2
School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.

Abstract

Twenty-seven soil samples were collected at ca. 5,000 m from the Changwengluozha glacier. In addition to soil components, the concentration of 23 organochlorine pesticides (OCPs) and 16 polycyclic aromatic hydrocarbons (PAHs) were analyzed. Clay minerals were found to play a key role in the accumulation of OCPs/PAHs in soil. The sorption ratio of chemical to clay was ordered in the OCPs and PAHs to the vapor pressure in a negatively correlated fashion. Because of the negative relationship between vapor pressure and the soil-air partition coefficients (KSA), it was understood that the higher sorption ratio responded to a higher KSA, which indicated the fate of the contaminants in soil. The soil near the Changwengluozha glacier functioned as a "sink" for OCPs in the decreasing order of 2,4'-DDT, 4,4'-DDD, HCB, δ-HCH, and α-HCH and for PAHs in an decreasing order of Pyr, Flu, Fl, Ace, and Acy.

KEYWORDS:

Clay minerals; Glacier; Persistent organic pollutants; Surface soil; Tibetan Plateau

PMID:
24295748
DOI:
10.1016/j.scitotenv.2013.11.061
[Indexed for MEDLINE]
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