[Characteristics of Water-soluble Ions in Atmospheric Particulates in Farmland in the Suburb of Nanjing].

• DOI: 10.13227/j.hjkx.202401097
• Publication Date: 2025-02-08
• Authors: Chao‐Yang Pan; Haiou Zhang; Wanping Liu; Hongyan Zhang; Jianling Fan
• Keywords: Water soluble

Water-soluble ions are an important component of atmospheric particles. However, there has been limited research on water-soluble inorganic in particulates agricultural areas until now. In this study, the characteristics eight （Na+, NH4+, K+, Mg2+, Ca2+, NO3-, SO42-, and Cl-） different sizes （>9.0, 5.8-9.0, 4.7-5.8, 3.3-4.7, 2.1-3.3, 1.1-2.1, 0.65-1.1, 0.43-0.65, <0.43 μm） were analyzed by sampling farmland suburb Nanjing from December 2020 to November 2021. The results showed that annual mass concentrations total suspended particulate matter （TSP）, < 9.0 μm 2.1 54.73, 49.04, 27.35 μg·m-3, respectively, all which reached national secondary standards. concentration accounted for 50.0% TSP, indicating fine particles main components area. was highest autumn, followed those spring/summer winter. SO42- primary contributor among seasons particle sizes, accounting 30.6%-66.5%. ratio SO42-/NO3- much higher than 1, contribution fixed-source pollution played a dominant role study Moreover, SOR （SO2 gas-particle conversion rate） less 0.1 only at individual times winter, mainly derived oxidation SO2 Significant positive correlations （P 0.05） between temperature observed except 4.7-5.8 particulates, increase significantly promoted photochemical formation process with sizes. relationship relative humidity significant smaller 0.05）, liquid phase reaction pathway Principal analysis used analyze sources particulates. it came transformation SO2, while coarse soil dust during tillage. great significance understanding ion areas. They provide reference source mechanisms near Nanjing.