沈阳市大气降水污染与沉降特征的城郊差异

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Abstract In order to understand the differences of precipitation pollution and deposition characteristic in Shenyang, the electrical conductivity, pH value, and concentration and deposition of water-soluble ion in precipitation were studied at Tiexi (urban) and Sujiatun (suburb) stations in Shenyang during 2018~2022. The results showed that the average pH values of two stations were 7.12 (6.09~8.36) and 7.11 (5.88~8.19), respectively, which indicated that precipitation was alkaline. The precipitation conductivity and the average concentration of total water-soluble ions at two sites were similar and showed a downward trend from 2018 to 2022. The mean relative acidity (FA) of the two sites in Shenyang was 0.0004, and the mean values of (Ca²⁺+NH₄⁺)/(SO₄^2-+NO₃^-) were 1.57 and 1.61, respectively, indicating strong neutralization ability of alkaline ions. The ratio of NO₃^-/SO₄^2- in precipitation was between 0.41 and 0.58. The wet deposition of SO₄^2--S was 1.14 and 2.20 times that of NO₃^--N and NH₄⁺-N, respectively, indicating that the precipitation in Shenyang was mainly dominated by sulfur deposition. The inorganic nitrogen deposition of urban station was generally higher than that of suburban station. The average deposition of NH₄⁺-N was 1.74 and 1.78 times that of NO₃^--N, respectively, implying that inorganic nitrogen in precipitation in Shenyang was dominated by reduced nitrogen. This was mainly related to automobile exhaust, urban green land maintenance, human excrement and frequent agricultural activities in the suburbs.

Key words： atmospheric precipitation chemical composition sulfur deposition nitrogen deposition Shenyang

Received: 30 November 2023

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X517

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	Articles by authors
	GUAN Jing-wen
	HOU Le
	SU Cong-cong
	SHEN Jian-dong
	YU Xing-na

Cite this article:

GUAN Jing-wen,HOU Le,SU Cong-cong等. Urban and suburban differences in precipitation pollution and deposition characterization in Shenyang[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(6): 3052-3059.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I6/3052

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