Characteristics and Sources of Inorganic Ions and Organic Acids in Precipitation in the Northern Suburb of Nanjing, China

被引：0
|
作者：
Yang X.-Y. [1 ]
Cao F. [1 ]
Lin Y.-Q. [1 ]
Zhang Y.-L. [1 ]
机构：
[1] Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing
来源：
Huanjing Kexue/Environmental Science | 2020年 / 41卷 / 06期
关键词：
Organic acids; Positive matrix factorization(PMF); Precipitation; Source identification; Water-soluble ions;
D O I：
10.13227/j.hjkx.201911049
中图分类号：
学科分类号：
摘要：
Rainwater samples were collected in Nanjing from December 2016 to November 2017. Water-soluble ion and organic acid content in rainwater samples was determined to analyze the chemical characteristics of precipitation and their seasonality. The positive matrix factorization (PMF) model was employed to identify the potential sources of precipitation. The results show that the volume-weighted mean of pH in precipitation was 5.6, which was higher than the results of previous studies conducted in Nanjing. The volume-weighted mean of total ions was 297.3 μmol•L-1, and the concentrations of each species were in the order of NH4 +>Ca2+>K+>Na+>Mg2+ for cations and NO3 ->SO4 2->Cl->F- for anions. The volume-weighted mean of organic acids was 2.86 μmol•L-1, with organic acids accounting for 2.2% of the total anions. CHO2 -, C2H3O2 -, and C2O4 2- were the main organic acids in precipitation with annual volume-weighted means of 1.35, 1.05, and 0.26 μmol•L-1, respectively. A significant seasonality was observed for the ions and organic acids. The volume-weighted mean of inorganic ions was higher in winter and spring compared to those in summer and autumn. On the other hand, the volume-weighted mean of total organic acids was the highest in summer, followed by spring, and the lowest in winter. High concentrations of organic acids in the summer can be attributed to the biogenic emissions from plants. The ratio of formic and acetic (F/A) showed that organic acids mainly originated from primary emissions (e.g., biogenic emissions, combustion of organics, and traffic emissions) rather than atmospheric oxidation processes. Using the PMF model, we found that marine sources and secondary inorganic products (40.0%) were the predominant sources of inorganic ions and organic acids in precipitation, followed by burning of biomass (22.2%), continental origin and waste incineration (22.0%), secondary organic products (14.5%), and biological emissions along with their secondary products (1.3%). © 2020, Science Press. All right reserved.
引用
收藏
页码：2519 / 2527
页数：8
相关论文
共 33 条
  • [21] Du W.J., Hong Z.Y., Chen Y.T., Et al., Spatiotemporal distribution and source apportionment of low molecular weight organic acids in wet precipitation at a coastal city, China, Environmental Science and Pollution Research, 24, 9, pp. 8399-8410, (2017)
  • [22] Niu Y.W., Li X.L., Pu J.J., Et al., Organic acids contribute to rainwater acidity at a rural site in eastern China, Air Quality, Atmosphere & Health, 11, 4, pp. 459-469, (2018)
  • [23] Long X.J., Wang X.M., Zhu S.J., Et al., Variation and source analysis of atmospheric organic acids from precipitation at Dinghu mountain, Environmental Chemistry, 30, 9, pp. 1611-1619, (2011)
  • [24] Zhang Y.L., Lee X., Cao F., Et al., Seasonal variation and sources of low molecular weight organic acids in precipitation in the rural area of Anshun, Chinese Science Bulletin, 56, 10, pp. 1005-1010, (2011)
  • [25] Sun X., Wang Y., Li H.Y., Et al., Organic acids in cloud water and rainwater at a mountain site in acid rain areas of South China, Environmental Science and Pollution Research, 23, 10, pp. 9529-9539, (2016)
  • [26] Xue G.Q., Zhu B., Wang H.L., Size distributions and source apportionment of soluble ions in aerosol in Nanjing, Environmental Science, 35, 5, pp. 1633-1643, (2014)
  • [27] Han L.H., Wang H.M., Xiang X., Et al., The characteristics of precipitation and its impact on fine particles at a representative region in Beijing, China Environmental Science, 39, 9, pp. 3635-3646, (2019)
  • [28] Fan F., Lu E., Ge B.Z., Et al., Analysis on scavenging effect of precipitation on PM<sub>2.5</sub> in Jiangsu, Zhejiang and Shanghai area, Journal of the Meteorological Sciences, 39, 2, pp. 178-186, (2019)
  • [29] Gao J., Zheng Y.F., Chen S.T., Chemical characteristics of precipitation in the industrial area to the north of the Yangtze River in Nanjing in 2007-2008, Transactions of Atmospheric Sciences, 35, 6, pp. 697-701, (2012)
  • [30] Zhang Z.F., Shen L.J., Zhu B., Et al., Chemical characteristics and potential sources of precipitation in Nanjing, Transactions of Atmospheric Sciences, 38, 4, pp. 473-482, (2015)
1234