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DOI | 10.5194/acp-18-5879-2018 |
Chemical characteristics of size-resolved atmospheric aerosols in Iasi, north-eastern Romania: nitrogen-containing inorganic compounds control aerosol chemistry in the area | |
Galon-Negru, Alina Giorgiana1; Olariu, Romeo Iulian1,2; Arsene, Cecilia1,2 | |
2018-04-26 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:8页码:5879-5904 |
文章类型 | Article |
语种 | 英语 |
国家 | Romania |
英文摘要 | This study assesses the effects of particle size and season on the content of the major inorganic and organic aerosol ionic components in the Iasi urban area, north-eastern Romania. Continuous measurements were carried out over 2016 using a cascade Dekati low-pressure impactor (DLPI) performing aerosol size classification in 13 specific fractions over the 0.0276-9.94 mu m size range. Fine-particulate Cl-, NO3-, NH4+ , and K+ exhibited clear minima during the warm season and clear maxima over the cold season, mainly due to trends in emission sources, changes in the mixing layer depth and specific meteorological conditions. Fine-particulate SO42- did not show much variation with respect to seasons. Particulate NH4+ and NO3- ions were identified as critical parameters controlling aerosol chemistry in the area, and their measured concentrations in fine-mode (PM2.5) aerosols were found to be in reasonable good agreement with modelled values for winter but not for summer. The likely reason is that NH4NO3 aerosols are lost due to volatility over the warm season. We found that NH4+ in PM2.5 is primarily associated with SO42- and NO3- but not with Cl-. Actually, indirect ISORROPIA-II estimations showed that the atmosphere in the Iasi area might be ammonia rich during both the cold and warm seasons, enabling enough NH3 to be present to neutralize H2SO4, HNO3, and HCl acidic components and to generate fine-particulate ammonium salts, in the form of (NH4)(2)SO4, NH4NO3, and NH4Cl. ISORROPIA-II runs allowed us to estimate that over the warm season similar to 35% of the total analysed samples had very strongly acidic pH (03), a fraction that rose to similar to 43% over the cold season. More-over, while in the cold season the acidity is mainly accounted for by inorganic acids, in the warm ones there is an important contribution by other compounds, possibly organic. Indeed, changes in aerosol acidity would most likely impact the gasparticle partitioning of semi-volatile organic acids. Overall, we estimate that within the aerosol mass concentration the ionic mass brings a contribution as high as 40.6 %, with the rest still being unaccounted for. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430947500005 |
WOS关键词 | PARTICULATE AIR-POLLUTION ; GAS-PHASE AMMONIA ; SOURCE APPORTIONMENT ; PARTICLE EMISSIONS ; RELATIVE-HUMIDITY ; MINERAL CATIONS ; PO VALLEY ; PM2.5 ; URBAN ; NITRATE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17330 |
专题 | 地球科学 |
作者单位 | 1.Alexandru Ioan Cuza Univ, Fac Chem, Dept Chem, 11 Carol 1, Iasi 700506, Romania; 2.Alexandru Ioan Cuza Univ, Integrated Ctr Environm Sci Studies North Eastern, 11 Carol 1, Iasi 700506, Romania |
推荐引用方式 GB/T 7714 | Galon-Negru, Alina Giorgiana,Olariu, Romeo Iulian,Arsene, Cecilia. Chemical characteristics of size-resolved atmospheric aerosols in Iasi, north-eastern Romania: nitrogen-containing inorganic compounds control aerosol chemistry in the area[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(8):5879-5904. |
APA | Galon-Negru, Alina Giorgiana,Olariu, Romeo Iulian,&Arsene, Cecilia.(2018).Chemical characteristics of size-resolved atmospheric aerosols in Iasi, north-eastern Romania: nitrogen-containing inorganic compounds control aerosol chemistry in the area.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(8),5879-5904. |
MLA | Galon-Negru, Alina Giorgiana,et al."Chemical characteristics of size-resolved atmospheric aerosols in Iasi, north-eastern Romania: nitrogen-containing inorganic compounds control aerosol chemistry in the area".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.8(2018):5879-5904. |
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