无锡市大气降水化学特征及来源解析

Chemical characteristics and source analysis of atmospheric precipitation in Wuxi City

基于2022年3月-2024年2月无锡市降水监测数据,对大气降水化学离子组成、降水类型、污染来源等进行分析。研究结果显示:无锡市大气降水铵离子浓度相对较高;降水类型表现为硫酸和硝酸混合型,固定源对致酸离子的贡献稍大于移动源,铵离子是主要碱性离子;硫酸根和硝酸根主要来自人为活动,钙、镁、钾离子主要来自地表,氯离子则来自海洋和人为因素。为提高无锡市环境空气质量,需强化铵离子等二次离子污染源的管控,并深入治理地表扬尘源,推动产业、能源、交通结构优化升级。

Based on precipitation monitoring data from March 2022 to February 2024 in Wuxi City,analyze the chemical ion composition,precipitation types,and pollution sources of atmospheric precipitation.The research results show that the concentration of ammonium ions in atmospheric precipitation in Wuxi is relatively high.The precipitation type is characterized by a mixture of sulfuric acid and nitric acid,with fixed sources contributing slightly more to acidifying ions than mobile sources,and ammonium ions being the main alkaline ions.Sulfate and nitrate ions mainly come from human activities,calcium,magnesium,and potassium ions mainly come from surface,and chloride ions come from the ocean and human factors.To improve the environmental air quality in Wuxi,it is necessary to strengthen the control of secondary ion pollution sources such as ammonium ions,and deeply manage surface dust sources,promoting the optimization and upgrading of industrial,energy,and transportation structures.