Yang Dong-yan, Liu Bao-xian, Zhang Da-wei, Chen Yuan-yuan, Zhou Jian-nan, Liang Yun-ping
Huan Jing Ke Xue. 2015 Mar;36(3):768-73.
A total of 486 daily PM2.5 samples were collected at a background site, 3 urban sites, 4 suburban sites and a boundary transfer site during August 2012-July 2013. Mass concentrations of 9 water-soluble ions were obtained. The average mass concentration of the 9 ions was 60.5 μg x m(-3), and the order of concentration of ions was NO3- > SO4(2-) > NH4(+)- > Cl- > Na+ > K+ > Ca2+ > F- > Mg2+; Secondary inorganic species NO3-, SO4(2-) and NH4+ were the major components of water-soluble ions in PM2.5, with a contribution of 88% to the total ions of PM2.5. NO3- was the most fluctuated anion during the sampling period. With the increase of pollution level, the accumulation of SNA was obvious, the components that contained nitrogen, NO3- and NH4+, occupied the dominant position in the formation of the secondary components. NO3- had a relatively higher contribution to the accumulation of heavy pollution.
2012年8月至2013年7月期间，在一个背景站点、3个城市站点、4个郊区站点和一个边界传输站点共采集了486个PM2.5日样本。获得了9种水溶性离子的质量浓度。9种离子的平均质量浓度为60.5μg x m(-3)，离子浓度顺序为NO3- > SO4(2-) > NH4(+)- > Cl- > Na+ > K+ > Ca2+ > F- > Mg2+；二次无机物种NO3-、SO4(2-)和NH4+是PM2.5中水溶性离子的主要成分，对PM2.5总离子的贡献率为88%。NO3-是采样期间波动最大的阴离子。随着污染水平的增加，SNA的积累明显，含氮成分NO3-和NH4+在二次成分形成中占据主导地位。NO3-对重污染积累的贡献相对较高。
