Ion Variation Characteristics and Source Analysis of Atmospheric Precipitation in Anning City from 2019 to 2023
Through the statistical analysis of precipitation monitoring data from 2019 to 2023 in Anning City,the characteristics and patterns of ion variations in atmospheric precipitation were explored.The analysis results indicated that there were no acid rain occurrences in Anning City during 2019-2023.The weighted annual average pH of precipitation ranged from 7.09 to 7.73,overall exhibiting weak alkalinity.Except for 2023,the electrical conductivity of precipitation showed a declining trend in the other four years,indicating an improvement in rainwater quality.SO42-and NO3-were the dominant anions,while Ca2+and NH4+were the main cations.The SO42-/NO3-ratio demonstrated a decreasing trend,although not significantly.Except for 2021,the precipitation was of a mixed type in the other four years.The trend of Cl-was significantlyupwardwith the acidity caused by gradually increasingexcessive chlorine in precipitation.Attention needs to be paid to the management of chlorine-containing waste gases.
NETL
NSTL
万方数据
