山西省榆次区干沉降水溶性阴离子的化学特征

为了解山西省榆次区大气干沉降中水溶性阴离子的化学组成及时间变化特征，采集榆次区2022年4月至2023年3月大气干沉降样品，利用相关性分析及HYSPLIT后向轨迹模式探讨干沉降中水溶性离子的化学特征及来源。结果表明：榆次区干沉降水溶性阴离子月平均浓度为846.158 μg/g，通量日平均值为589.7 μmol/(m2·d)，季节变化为冬季＞秋季＞春季＞夏季；PM2.5/PM10和NO2/SO2佐证了扬尘和燃煤对榆次区环境污染及离子浓度的贡献率；干沉降阴离子的浓度变化受到降水及本地气团的影响。

The Chemical Characteristics of Dry Deposition Water-soluble Ions in Yuci District, Shanxi Province

In order to understand the chemical composition and temporal variation characteristics of water-soluble anions in atmospheric dry deposition in Yuci District, Shanxi Province, atmospheric dry deposition samples from April 2022 to March 2023 in Yuci District were collected . The chemical characteristics and sources of water-soluble ions in dry deposition were discussed by correlation analysis and HYSPLIT backward trajectory model. The results show that the monthly average concentration of water-soluble anions in dry deposition in Yuci District is 846.158 μg/g, the daily average flux is 589.7 μmol/(m2·d), and the seasonal variation is winter>autumn>spring>summer. PM2.5/PM10 and NO2/SO2 support the contribution rate of fugitive dust and coal combustion to environmental pollution and ion concentration in Yuci District, and the concentration change of dry deposition anion is affected by precipitation and local air mass.