Study on Variation Trend and Chemical Composition of Precipitation in Meishan from 2015 to 2020
In order to further learn the atmospheric precipitation situation and its impact on the ecological environment of Meishan,the atmospheric precipitation quality and its pollution situation were analyzed in this paper by analyzing the changes of pH,rainfall,electrical conductivity and inorganic ion concentration in atmospheric precipitation and their correlation based on the data of three precipitation monitoring sites in Meishan from 2015 to 2020.The results showed that the range of atmospheric precipitation pH in Meishan was 5.67 to 8.26 from 2015 to 2020,and there was no acid rain.Both the precipitation and electrical conductivity of atmospheric precipitation showed a decreasing trend.Generally,the electrical conductivity reached its maximum in 2016.The electrical conductivity in 2019 significantly decreased by 49.12％compared with that of 2016.From 2015 to 2020,the total ion mass concentration of atmospheric precipitation was 33.08,33.04,32.87,29.20,17.48 and 19.60 mg/L,respectively,showing a decreasing trend overall,indicating that the air pollution control measures had a positive effect.The chemical composition of each ion concentration ranked as SO4-＞NO3-＞Ca2+＞NH4+＞Cl-＞Na+＞K+＞Mg2+＞F-.The ratio of SO4-/NO3-ranged from 0.80 to 2.92.According to the classification of pollutant emission sources,the precipitation was the mixed precipitation.The Pearson correlation analysis showed there were a significant correlation between SO42-and Ca2+,NO3-,F-and Cl-of atmospheric precipitation in 2020,indicating that these ions have the same chemical origin.In 2020,the correlation between SO42-and Ca2+,and between NO3-,F-and Cl-in precipitation were extremely significant,indicating that their pollution sources were the same.
Atmospheric precipitationcomposition of ionsMeishan
国家科技期刊平台
NSTL
万方数据
