重庆市大气降水污染及其沉降特征

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Abstract

The precipitation conductivity, pH value and water-soluble ion concentration of precipitation in Chongqing from 2002 to 2016 were studied based on the wet deposition data from Acid Deposition Monitoring Network in East Asia (EANET). The acidification of rainfall at rural site of Chongqing was serious, while precipitation pollution at urban site was serious. Average concentrations of water-soluble ions in precipitation at urban and rural sites reached 627.00μeq/L and 480.14μeq/L, respectively. The average concentrations of SO₄^2-, NH₄⁺ and Ca²⁺ at urban site was 1.21~1.47times higher than those at rural site. The ratio of SO₄^2- to NO₃^- indicated that the type of precipitation in Chongqing changed from sulfuric acid type to sulfuric acid-nitric acid mixed type. The main ion deposition at urban site was relatively high and about 1.14times that of the rural site. The inorganic nitrogen deposition in precipitation varied from 17.59kg/(hm²·a) to 47.31kg/(hm²·a) and was dominated by ammonium-nitrogen (NH₄⁺-N). The average deposition of NH₄⁺-N was about twice as much as that of NO₃^--N, indicating serious NH₃/NH₄⁺-N pollution in Chongqing.

Key words： atmospheric precipitation acid rain nitrogen deposition

Received: 25 February 2019

PACS:

X517

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	Articles by authors
	HOU Si-yu
	YU Xing-na
	GONG Ke-jian
	WANG Guo-zhen
	NIU Xi
	LI Mei

Cite this article:

HOU Si-yu,YU Xing-na,GONG Ke-jian等. Pollution and deposition characteristics of precipitation in Chongqing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(10): 4100-4107.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I10/4100

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