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Open AccessArticle

Hydrochemical Characteristics and Ion Sources of Precipitation in the Upper Reaches of the Shiyang River, China

1
College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
2
State Key Laboratory of Cryosphere Science, Northwest institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730070, China
3
Gansu Engineering Research Center of Land Utilization and Comprehension Consolidation, Lanzhou 730070, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(5), 1442; https://doi.org/10.3390/w12051442
Received: 2 April 2020 / Revised: 11 May 2020 / Accepted: 14 May 2020 / Published: 19 May 2020
(This article belongs to the Special Issue Environmental Chemistry of Water Quality Monitoring)
The Shiyang River Basin is located at the edge of the monsoon wind system of South and Southeast Asia. The hydrochemical characteristics of precipitation are influenced by both monsoon and arid regions. The regression analysis method, comparative analysis, neutralization factor (NF), enrichment factor (EF) and HYSPLIT4 were used to analyze the precipitation samples collected from the upper reaches of the Shiyang River from October 2016 to October 2017. In order to study the hydrochemical characteristics and ion sources of precipitation in this basin. The results, as discussed in this paper, show that the precipitation in the upper reaches of the Shiyang River is mildly alkaline all year round while the neutralization ability of Ca2+ and NH4+ in precipitation is strong. The ion concentration was higher in the dry season than that in the wet season, but the concentration of NH4+ was higher in summer. Furthermore, as the altitude increased, the electrical conductivity (EC) of the precipitation decreased gradually. Influenced by precipitation and rainy days, the wet deposition of nitrogen (N) and sulfur (S) was higher in the wet season than that during the dry season, and the wet deposition gradually increased with the elevation. In precipitation, the earth’s crust is a major source of Ca2+, K+ and Mg2+, the ocean is a major source of Cl, the ocean and the earth’s crust are the sources of Na+, human activities are the main sources of SO42−, NO3 and NH4+, the amount of F is very small, its sources are natural and human activities. Water vapor in precipitation mainly comes from westerly air mass circulation and monsoon circulation while the particles come mainly from the earth’s crust. View Full-Text
Keywords: Shiyang River; precipitation; ion; wet deposition; enrichment factor method Shiyang River; precipitation; ion; wet deposition; enrichment factor method
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Zhang, Z.; Jia, W.; Zhu, G.; Ma, X.; Xu, X.; Yuan, R.; Shi, Y.; Yang, L.; Xiong, H. Hydrochemical Characteristics and Ion Sources of Precipitation in the Upper Reaches of the Shiyang River, China. Water 2020, 12, 1442.

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