Characteristics of organic acids and inorganic components in three-stage fog water in Nanjing
ZHU Dan-dan1,2, FAN Shu-xian1,2, HU Chun-yang3, ZHANG Hong-wei2, ZHANG Si-rui2, ZHANG Lu-yao2
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol Cloud Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. Nanjing University of Information Science and Technology, Department of Atmospheric Physics, Nanjing 210044, China; 3. Unit 94582 of People's Liberation Army of China, Queshan 463217, China
Abstract:In this study, a systematic 45-day field observation of fog was conducted in the northern suburb of Nanjing during the winter of 2017. Eleven fog water samples were collected in a dense fog event occurring at December 30 and 31, 2017, by using a Caltech Active Strand Cloud Collector (CASCC) with three cutting diameter ranges (S1: > 22μm; S2: 16~22μm; S3: 4~16μm). In this observation, concentrations of organic acids and inorganic ions as well as the pH value and the electrical conductivity (EC) of the samples were measured, so that the chemical properties of the fog water were revealed. The results showed that the fog water samples were alkaline, and the dominant ionic compositions were Ca2+, NH4+, SO42- and NO3-. The major organic acid compositions were found as formate (HCOO-), methanesulfonate (CH3SO3-), oxalate (C2O42-), and acetate (CH3COO-). Moreover, it was shown that the weighted mean volume concentrations of each type of the ions as well as the total ions were size-dependent, “U”-shaped, and concentrate in small fog droplets with a size range of 4~16μm. The concentrations of the four major organic acid compositions were also found strongly correlated with each other. The observational data showed that Ca2+ and NH4+ in the fog water were the key factors leading to the alkalinity of the water. In addition, we found that compared to the fog water collected in the year 2013, the acidity of the fog water collected in 2017 was lower, which was attributed to the reduction of acid-causing components and the occurrence of neutralization reactions.
朱丹丹, 樊曙先, 胡春阳, 张鸿伟, 张思蕊, 张璐瑶. 南京三级分档雾水有机酸和无机组分化学特征[J]. 中国环境科学, 2020, 40(8): 3342-3351.
ZHU Dan-dan, FAN Shu-xian, HU Chun-yang, ZHANG Hong-wei, ZHANG Si-rui, ZHANG Lu-yao. Characteristics of organic acids and inorganic components in three-stage fog water in Nanjing. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(8): 3342-3351.
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