忻府区大气降水的离子组成特征及来源分析OA

Based on continuous 10-year precipitation monitoring data from 2014 to 2023 in Xinfu District,a systematic analysis of the composition characteristics,pollution types,and sources of water-soluble ions in the atmospheric precipitation of the region was carried out.The results show that the precipitation in Xinfu District is generally neutral,and the electrical conductivity(EC)is influenced by a variety of environmental factors.The dominant anions in the precipitation are SO42-and NO3 ⁻,while the dominant cations are Ca2+and Na+,indicating that Ca2+and Na+are the main ions neutralizing the acidic substances in the precipitation.The SO42-/NO3⁻ ratio in the precipitation over the years ranges from 5.1 to 17.3(much greater than 3),showing typical coal-burning(sulfuric)pollution characteristics.Ion correlation and source contribution analysis confirmed that K+and Ca2+are primarily influenced by terrestrial inputs,Mg2+is affected by both marine and terrestrial sources,and 98.2%of Cl ⁻ originates from the ocean.SO42-and NO3 ⁻ are mainly from anthropogenic sources(with SO42-also influenced to some extent by the ocean),and the contribution of anthropogenic sources to NO3⁻ is as high as 98.0%.