[Correlation, seasonal and temporal variation of water-soluble ions of PM2.5 in Beijing during 2012-2013].
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.
Dong-yan
DY
Yang
Bao-xian
BX
Liu
Da-wei
DW
Zhang
Yuan-yuan
YY
Chen
Jian-nan
JN
Zhou
Yun-ping
YP
Liang
D000393:Air Pollutants / Q000032:analysis*; D002680:Chin; D002947:Cities; D004784:Environmental Monitoring; D007477:Ions; D052638:Particulate Matter / Q000032:analysis*; D012621:Seasons; D014867:Water
D000393:Air Pollutants; D007477:Ions; D052638:Particulate Matter; D014867:Water