黄河源区鄂陵湖中多环芳烃的百年沉积记录

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Abstract The pollution history of polycyclic aromatic hydrocarbons (PAHs) in the source region of the Yellow River was investigated with a sediment core in Ngoring Lake collected in July 2016. The chronology was dated by ²¹⁰Pb and 16US-EPA priority PAHs were determined by the gas chromatography-tandem mass spectrometry (GC-MS/MS). The results showed that the average sedimentation rate was 0.176cm/a, which was slower than most lakes in Tibetan Plateau. The concentrations of Σ₁₆PAHs ranged from 11.3ng/g to 54.7ng/g with a mean value of 29.2ng/g, which stayed at a low level compared with other lake sediments in Tibetan Plateau and remote regions. The concentrations of PAHs in Ngoring Lake can be considered as the global background value of PAHs in lake sediments. The vertical distribution of PAHs was divided into three periods:before 1948, 1948~1976, and 1976~2016 by the sequential cluster analysis. Five-ring and six-ring PAHs increased from 1948 to 2016 and significantly correlated with population and amounts of big livestock in Qinghai Province, indicating that ranching was the dominant human activities around Ngoring Lake. The results of principle components analysis combined with multiple linear regression showed the sources of PAHs may be attributed to the local source and the mixed source of long-range atmospheric transport and local emission. These two sources contributed 23% and 77% to the total PAHs, respectively. The vertical trend of the local source coincided with five-and six-ring PAHs, which is correlated with that cow dung is the major fuel in Tibetan Plateau.

Key words： Tibetan Plateau polycyclic aromatic hydrocarbons (PAHs) sequential cluster analysis principal component analysis source apportionment

Received: 10 January 2019

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X524

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	DING Yang
	ZHENG Huang
	HUANG Huan-fang
	ZHANG Yuan
	CHEN Ying-jie
	LIAO Ting
	Liu Jin-hong
	XING Xin-li
	QI Shi-hua

Cite this article:

DING Yang,ZHENG Huang,HUANG Huan-fang等. Centennial sedimentary records of polycyclic aromatic hydrocarbons (PAHs) in Ngoring Lake at the source region of the Yellow River, Tibetan Plateau[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3465-3473.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3465

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