Li Qing, Huang Wen-Qian, Ma Shuai-Shuai, Huang Hong-Ying, Ye Zhao-Lian, Chen Min-Dong
School of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China.
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Huan Jing Ke Xue. 2019 Jan 8;40(1):94-103. doi: 10.13227/j.hjkx.201805078.
To understand the characteristics and sources of water-soluble organic carbon (WSOC) and organic nitrogen (WSON) in atmospheric aerosols during spring in Changzhou, 84 fine particle (PM) samples were collected from March 1 to May 30, 2017, in Changzhou. The water-soluble components, including water-soluble organic carbon, water-soluble total nitrogen (WSTN), water-soluble ions, and carbonaceous components (OC and EC), were analyzed. The levels of WSOC and WSON and their source characteristics were discussed. The results show that the average concentrations of PM, WSOC, and WSON are 101.97, 7.63, and 1.50 μg·m, respectively, during the sampling period. The WSON accounts for 12.9% of the WSTN and the water-soluble inorganic nitrogen mainly exists in two forms, that is, NH and NO, accounting for 86.15% of the WSTN. The WSOC is weakly correlated with WSON (=0.58), indicating that WSOC and WSON do not have the same sources. The WSOC is related to SOC, K, and secondary ions (SO, NH, and NO), indicating that it is mainly derived from biomass burning and secondary conversion; WSON is strongly correlated to secondary ions, indicating that it is mainly derived from secondary conversion. The wind speed is the main factor affecting the WSOC and WSON concentration levels. Furthermore, the WSON is positively correlated with the air pressure and negatively correlated with the temperature. The results of the principal component analysis show that PM mainly originates from four sources:secondary formation, dust, coal combustion, biomass burning, and the ocean. The backward trajectory analysis indicates that the total concentrations of PM, WSOC, and WSON in air masses from long-distance transformation are higher than that from short-distance transmission, whereas there is no significant difference in the WSON/WSTN ratio from different transmission paths.
为了解常州市春季大气气溶胶中水溶性有机碳（WSOC）和有机氮（WSON）的特征及来源，于2017年3月1日至5月30日在常州市采集了84个细颗粒物（PM）样本。分析了水溶性成分，包括水溶性有机碳、水溶性总氮（WSTN）、水溶性离子和碳质成分（OC和EC）。讨论了WSOC和WSON的含量水平及其来源特征。结果表明，采样期间PM、WSOC和WSON的平均浓度分别为101.97、7.63和1.50μg·m 。WSON占WSTN的12.9%，水溶性无机氮主要以两种形式存在，即NH 和NO ，占WSTN的86.15%。WSOC与WSON呈弱相关（ =0.58），表明WSOC和WSON来源不同。WSOC与SOC、K和二次离子（SO 、NH 和NO ）相关，表明其主要来源于生物质燃烧和二次转化；WSON与二次离子强相关，表明其主要来源于二次转化。风速是影响WSOC和WSON浓度水平的主要因素。此外，WSON与气压呈正相关，与温度呈负相关。主成分分析结果表明，PM主要来源于四个源：二次形成、扬尘、煤炭燃烧、生物质燃烧和海洋。后向轨迹分析表明，长距离传输气团中PM、WSOC和WSON的总浓度高于短距离传输气团，而不同传输路径的WSON/WSTN比值无显著差异。
