Spatial and temporal variation of inorganic ions in rainwater in Sichuan province from 2011 to 2016

Environmental Pollution
Junlin LiHongbo Fu

Abstract

China continues to suffer from severe acid deposition, despite the government implying a series of policies to control air pollution. In this study, rainwater samples were collected from 2011 to 2016 in Sichuan province to measure the pH values and the concentrations of nine inorganic ions (SO42-, NO3-, NH4+, Cl-, Na+, Ca2+, K+, Mg2+, and F-), and then to investigate their spatiotemporal variations. Besides, the dominant sources for the acidic ions in the precipitation were also revealed by statistical model. The results showed that the rainwater continued to be highly acidic, and the Volume-Weighted Mean (VWM) pH value was calculated to be 5.18 during 2011 and 2016. NH4+, Ca2+, NO3-, and SO42- were the dominant water-soluble inorganic ions, accounting for 79.2% of the total ions on average. The remarkable decrease in NO3- and SO42- concentrations (from 75.9 to 54.3 μeq L-1 and from 285 to 145 μeq L-1, respectively) resulted in an increase in the pH value of rainwater from 5.24 in 2011 to 5.70 in 2016. The concentrations of SO42-, NO3-, F-, Na+, and K+ showed remarkably seasonal variation, with the highest value observed in winter, followed by spring and autumn, and the lowest value observed in summer. High VWM concentration of...Continue Reading

Citations

Jun 15, 2020·Environmental Science and Pollution Research International·Kamal Jyoti Maji, Chinmoy Sarkar
Sep 29, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·X J LiuF S Zhang
Nov 17, 2020·Frontiers in Microbiology·Yinhua WuXiaoyan Liu
Jan 24, 2021·Environmental Science and Pollution Research International·Lulu CuiYing Chen
Jul 30, 2021·The Science of the Total Environment·Yixi Qiu, Joseph David Felix
Nov 29, 2021·Environmental Science and Pollution Research International·Md Sahbaz AhmedRaza R Hoque

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