兰州市叶面尘磁性与黑碳特征对大气污染的响应

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Abstract In order to explore the characteristic of magnetic and element carbon (EC) of the particles on the surface of leaf and their response to ambient atmospheric pollution, the weight of leaf deposited particles, magnetism and concentration of particles on the surface of leaf were measured which collected from Buxus sinica and Juniperus formosana in different functional areas of Lanzhou city. The results of magnetic parameters suggested that the magnetic characteristics of leaf deposited particles in traffic area were dominated by ferrimagnetic minerals with low coercivity, and the grain size was dominated by pseudo single domain (PSD) particles. The SIRM of Buxus sinica and Juniperus formosana in traffic area (489.40×10^-6A, 290.73×10^-5A·m²/kg, respectively) are higher than that in park (99.56×10^-6A, 74.00×10^-5A·m²/kg, respectively) and residential area (61.91×10^-6A, 209.79×10^-5A·m²/kg). and the spatial distribution of EC in line with SIRM,showed that SIRM were significantly influenced by the sources and concentration of pollutants in ambient environment. A significant correlation(r=0.94,0.94;P<0.0001) was observed between SIRM and EC, indicated that SIRM can effectively respond to the dust retention and element carbon concentration of particles on the leaf surface, and it can be used as an effective magnetic parameter to indicate the particulate pollution on the surface of leaf and then reflect the ambient atmospheric pollution. Environmental magnetic research with urban green plant leaves as the carrier can achieve environmental-friendly monitoring with high spatial resolution of particulate pollution

Key words： leaf deposited particles element carbon magnetic characteristics atmospheric pollution Lanzhou City

Received: 27 December 2018

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X513

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	WANG Bo
	CHEN Hong
	XIA Dun-sheng
	LI Gang
	MA Shan
	LIU Hui

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WANG Bo,CHEN Hong,XIA Dun-sheng等. On the magnetic characteristic of leaf-deposited particles and element carbon and its response to air pollution[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3178-3185.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3178

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