泸州市大气降水的化学特征的探讨

Discussion on Chemical Characteristics of Atmospheric Precipitation in Luzhou

为了解泸州市大气降水的化学组成和季节变化特征,2019年1月~12月采集了降水样品共64个,对其pH值、电导率和主要离子组分进行测定。结果表明,泸州市2019年降水电导率的雨量加权平均值为2.3 mS/m,pH值的雨量加权平均值为5.4,酸雨频率为39.1%。SO4^2-和NO3^-是降水的主要致酸离子,NH4^+和Ca^2+是降水中酸性离子的主要中和离子。电导率及主要离子组分浓度的时间变化特征表现为秋冬季较高,夏季最低。泸州市降水的污染物主要来源于人为源和土壤源。

In order to understand the chemical composition and seasonal variation characteristics of atmospheric precipitation in Luzhou city,a total of 64 rainwater samples were collected from January 2019 to December 2019.All samples were analyzed for pH values,electrical conductivity and major ionic components.The results showed that the volume-weighted average of electrical conductivity and pH values were 2.3 mS/m and 5.4 in rainwater respectively.The frequency of acid rain was 39.1%.SO4^2- and NO3^- were the main acid-producing ions in precipitation,while NH+4 and Ca^2+ were the dominant neutralizing ions in precipitation.Electrical conductivity and main ion concentrations were higher in autumn and winter and lowest in summer.The pollutants of precipitation mainly came from anthropogenic source and soil source.