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| A preliminary study of organosulfates in atmospheric aerosols at Tian-jing-shan national air background monitoring station in Nanling Mountains, South China |
| WANG An-hou1, ZHANG Shen-yang1, WANG Hao1, GONG Dao-cheng1, ZHANG Shi-yang1, SONG Wei1, CHEN Duo-hong3, ZHOU Lei1, WANG Bo-guang1,2 |
1. Institute of Environment and Climate Research, Jinan University, Guangzhou 511443, China;
2. Research Center on Low-carbon Economy for Guangzhou Region, Jinan University, Guangzhou 510632, China;
3. Guangdong Environmental Monitoring Center, Guangzhou 510308, China |
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Abstract IEPOX-derived organosulfates were observed for the first time in secondary organic aerosols (SOA) at the Tian-jing-shan national air background monitoring station in the Nanling Mountains, South China, during the rainy season in 2015 using a single particle aerosol time-of-flight mass spectrometry (SPAMS). The chemical constituents of fine particles were divided into 9 categories by using the adaptive resonance theory (neural network algorithm, ART-2a): elemental carbon, organic carbon, elemental/organic mixed carbon, levoglucosan, potassium-rich, sodium-rich, silicon-rich, metals and organic amines. The ionic tracer method was used to explore the diurnal variation of IEPOX-derived organosulfates in the forest. The variation of organosulfates seemed to correlated with O3 but not with SO2 and CO. In addition, organosulfates are much easier to form at high relative humidity (> 90%) and low temperatures (<18℃). The IEPOX-derived organosulfates were found to be 49% higher during nighttime than in daytime, likely due to higher humidity and lower temperatures at night. The results of this work demonstrate that the studied forest area has been impacted by anthropogenic air pollutants, as indicated by the formation of anthropogenic SOAs.
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Received: 02 November 2016
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