Seasonal variation and secondary formation of size-segregated aerosol water-soluble inorganic ions in a coast megacity of North China Plain

2020 ◽  
Vol 27 (21) ◽  
pp. 26750-26762
Author(s):  
Qing Yao ◽  
Zirui Liu ◽  
Suqin Han ◽  
Ziying Cai ◽  
Jingle Liu ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
North China Plain ◽  
North China ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Secondary Formation ◽  
Water Soluble Inorganic Ions

Seasonal variation and secondary formation of size-segregated aerosol water-soluble inorganic ions during pollution episodes in Beijing

2016 ◽  
Vol 168 ◽  
pp. 70-79 ◽  
Author(s):  
Xiaojuan Huang ◽  
Zirui Liu ◽  
Junke Zhang ◽  
Tianxue Wen ◽  
Dongsheng Ji ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Secondary Formation ◽  
Water Soluble Inorganic Ions ◽  
Pollution Episodes

Composition and mixing state of water soluble inorganic ions during hazy days in a background region of North China

2015 ◽  
Vol 58 (11) ◽  
pp. 2026-2033 ◽  
Author(s):  
YaLing Lu ◽  
JianWei Chi ◽  
Lan Yao ◽  
LingXiao Yang ◽  
WeiJun Li ◽  
...  
Keyword(s):  
North China ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Mixing State ◽  
Background Region ◽  
State Of Water ◽  
Water Soluble Inorganic Ions

Water-soluble inorganic ions of size-differentiated atmospheric particles from a suburban site of Mexico City

2017 ◽  
Vol 75 (2) ◽  
pp. 155-169 ◽  
Author(s):  
Telma Castro ◽  
Oscar Peralta ◽  
Dara Salcedo ◽  
José Santos ◽  
María I. Saavedra ◽  
...  
Keyword(s):  
Mexico City ◽  
Inorganic Ions ◽  
Atmospheric Particles ◽  
Water Soluble ◽  
Water Soluble Inorganic Ions ◽  
Suburban Site

scholarly journals Chemical Characteristics of Water-Soluble Ions in Particulate Matter in Three Metropolitan Areas in the North China Plain

PLoS ONE ◽  
2014 ◽  
Vol 9 (12) ◽  
pp. e113831 ◽  
Author(s):  
Xu Dao ◽  
Zhen Wang ◽  
Yibing Lv ◽  
Enjiang Teng ◽  
Linlin Zhang ◽  
...  
Keyword(s):  
Particulate Matter ◽  
North China Plain ◽  
North China ◽  
Metropolitan Areas ◽  
Water Soluble ◽  
Chemical Characteristics ◽  
The North ◽  
The North China Plain ◽  
Soluble Ions ◽  
Water Soluble Ions

scholarly journals The sensitivity of PM<sub>2.5</sub> acidity to meteorological parameters and chemical composition changes: 10-year records from six Canadian monitoring sites

2019 ◽  
Author(s):  
Ye Tao ◽  
Jennifer G. Murphy
Keyword(s):  
Chemical Composition ◽  
Meteorological Parameters ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Seasonal Cycles ◽  
Accuracy And Precision ◽  
Different Seasons ◽  
Water Soluble Inorganic Ions ◽  
Composition Changes

Abstract. Aerosol pH is difficult to measure directly but can be calculated if the chemical composition is known with sufficient accuracy and precision to calculate the aerosol water content and the H+ concentration through ion balance. In practical terms, simultaneous measurements of at least one semi-volatile constitute, e.g. NH3 or HNO3, are required to provide a constraint on the calculation of pH. Long-term records of aerosol pH are scarce due to the limited monitoring of NH3 in conjunction with PM2.5. In this study, 10-year (2007–2016) records of pH of PM2.5 at six eastern Canadian sites were calculated using the E-AIM II model with the input of gaseous NH3, gaseous HNO3 and major water-soluble inorganic ions in PM2.5 provided by Canada's National Air Pollution Surveillance (NAPS) Program. Clear seasonal cycles of aerosol pH were found with lower pH (~2) in summer and higher pH (~3) in winter consistently across all six sites, while the day-to-day variations of aerosol pH were higher in winter compared to summer. Tests of the sensitivity of aerosol pH to meteorological parameters demonstrate that the changes in ambient temperature largely drive the seasonal cycle of aerosol pH. The sensitivity of pH to chemical composition shows that pH has different responses to the changes in chemical composition in different seasons. During summertime, aerosol pH was mainly determined by temperature with limited impact from changes in NHx or sulfate concentrations. However, in wintertime, both meteorological parameters and chemical composition contribute to the variations in aerosol pH, resulting in the larger variation during wintertime. This study reveals that the sensitivity of aerosol pH to chemical composition is distinctly different under different meteorological conditions and needs to be carefully examined for any particular region.

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