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Fog water, aerosol, and gas were separately collected at Mt. Rokko (altitude 931 m) in Kobe, Japan, using a new sampling method at a mountainous site near a highly industrialized area. The fog water was collected by an active string-fog collector and the aerosol and gas by using the filter pack method. Using plural filter packs and controlling or switching the airflow before, during, and after a fog event made it possible to collect the fog water, aerosol, and gas separately. Nitrate species such as NO 3 − (p) and HNO 3 (g) were effectively scavenged by fog water, while sulfur species such as SO 4 2− (p) and SO 2 (g) could not be easily and effectively scavenged because of the poor solubility of SO 2 (g). This difficulty was experimentally examined through an in situ investigation. Ion species (especially Na + (p) and Ca 2+ (p)) which form coarse particles were easily and effectively scavenged by fog water. On the other hand, the difficulty of scavenging Mg 2+ (p) could not be explained by particle size. |
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