Tao Yue-le, Li Qin-Kai, Zhang Jun, Li Si-Qi, Li Xiao-Dong
Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2017 Oct 8;38(10):4034-4043. doi: 10.13227/j.hjkx.201702175.
Size-resolved atmospheric particles were collected monthly from February 2012 to January 2013 on the campus of Chengdu University of Technology using the Anderson multi-stage impactor sampler. The mass concentrations of these samples and the contents of nine water-soluble ion species were analyzed. The results showed that the annual average concentrations of PM and PM in Chengdu during the sampling period were (125.9±56.14) μg·m and (224.5±83.64) μg·m, respectively. The highest mass concentration of particulate matter was observed in winter, followed by spring while the lowest was in autumn. The average content of water-soluble ions in particulate matter in Chengdu was about 37.15 μg·m and the order of water-soluble ion mass concentrations was SO > NO > NH > Ca > Cl > Mg > K > Na > F. Meanwhile, SO, NO, and NH were the major water-soluble ionic components that accounted for 78% of total water-soluble ions. Unimodal distribution was observed for SO, NO, and NH mainly in fine particles, while Ca and F were concentrated in coarse particles and their distribution was also unimodal. Similar size distributions were found for Cl and K, as well as Mg and Na, both of which were bimodal. The content of water-soluble ions in both fine and coarse particles during winter and spring was significantly higher than that in summer and autumn in Chengdu. Based on the correlation analysis for major ions, SO, NO, and NH in fine particles are likely in the form of (NH)SO, NHHSO, and NHNO. In coarse particles, the major water-soluble ions (i.e. SO, NO, and Ca) might exist in the forms of Ca(NO) and CaSO. The secondary formation processes, soil dust, and biomass burning are the major sources of water-soluble ion species in the particulate matter in Chengdu.
2012年2月至2013年1月期间，在成都理工大学校园内每月使用安德森多级冲击采样器收集不同粒径的大气颗粒物。分析了这些样品的质量浓度以及9种水溶性离子的含量。结果表明，采样期间成都PM 和PM 的年均浓度分别为(125.9±56.14) μg·m 和(224.5±83.64) μg·m 。颗粒物质量浓度最高值出现在冬季，其次是春季，最低值出现在秋季。成都颗粒物中水溶性离子的平均含量约为37.15 μg·m ，水溶性离子质量浓度顺序为SO > NO > NH > Ca > Cl > Mg > K > Na > F。同时，SO、NO和NH是主要的水溶性离子成分，占水溶性离子总量的78%。SO、NO和NH主要在细颗粒物中呈单峰分布，而Ca和F集中在粗颗粒物中且其分布也是单峰的。Cl和K以及Mg和Na的粒径分布相似，均为双峰。成都冬春季节细颗粒物和粗颗粒物中水溶性离子的含量均显著高于夏秋季节。基于主要离子的相关性分析，细颗粒物中的SO、NO和NH可能以(NH)SO、NHHSO和NHNO的形式存在。在粗颗粒物中，主要的水溶性离子（即SO、NO和Ca）可能以Ca(NO)和CaSO的形式存在。二次形成过程、土壤扬尘和生物质燃烧是成都颗粒物中水溶性离子物种的主要来源。
