title: Characteristic study of dry deposition, concentration, compositions for particulates mass and ionic species during summer and autumn season at a traffic sampling site.
abstract: Aerosol samples for dry deposition and total suspend particulates (TSP) were collected from August to November of 2003 in central Taiwan. Ion chromatography was used to analyze the related water-soluble ionic species (Cl(-), NO(3)(-), SO(4)(2-), Na(+), NH(4)(+), K(+), Mg(2+) and Ca(2+)). The results obtained in this study indicated that the ambient air particulate mass concentrations in the daytime period (averaged 975.4 microg m(-3)) were higher than the nighttime period (averaged 542.1 microg m(-3)). And the daytime dry deposition fluxes (averaged 58.12 microg m(-2) sec(-1)) were about 2.2 times as that of nighttime dry deposition fluxes (averaged 26.54 microg m(-2) sec(-1)) of the downward dry deposition. The average values downward and upward of dry deposition fluxes for the weekend period were almost higher than the weekday period for either daytime or nighttime period. Furthermore, the average daytime dry deposition fluxes (averaged 26.37 microg m(-2) sec(-1)) were also about 2.3 times as that of nighttime dry deposition fluxes (averaged 11.52 microg m(-2) sec(-1)). Moreover, the results also indicate that SO(4) (2-) and Ca(2+) have higher average composition for total suspended particulates in the daytime period while Ca(2+), SO(4) (2-), and Na(+) have the higher average composition for total suspends particulates in the nighttime period.
authors.affiliation: Air Toxic and Environmental Analysis Laboratory, Hungkuang University, Sha-Lu, Taichung 433, Taiwan. gcfang@sunrise.hk.edu.tw
authors.forename: Guor-Cheng
authors.initials: GC
authors.lastname: Fang
authors.forename: Yuh-Shen
authors.initials: YS
authors.lastname: Wu
authors.forename: Jui-Yeh
authors.initials: JY
authors.lastname: Rau
authors.forename: Shih-Han
authors.initials: SH
authors.lastname: Huang
mesh_terms: D000397:Air Pollution; D004784:Environmental Monitoring; D007477:Ions / Q000737:chemistry*; D052638:Particulate Matter / Q000737:chemistry*; D012621:Seasons; D012995:Solubility; D013997:Time Factors
chemical_list: D007477:Ions; D052638:Particulate Matter