Abstract:The air condensation water (ACW) was collected using an in-situ self-assembled collector on 8 March~11 April, 2011, in Shanghai. The chemical characteristics of the samples were studied in detail, and the results were compared to those of other wet deposition in terms of inter-ion correlativity, ion concentration in relation to temporal variations. The pH values of the samples ranged from 6.1~7.2 with a volume-weighted mean pH value of 6.5, mostly exhibiting weak acidity. Both NH4+ and SO42- were the most abundant components and volume-weighted means were 139.7μeq/L and 125.7μeq/L, respectively. SO42- was the predominant acid anion. The NO2- (9.9 μeq/L) concentration was somewhat higher than that of NO3- (9.5μeq/L) and the detection rate of NO2- was 100% in all samples. The low-volatility organic acids of MSA- (6.0μeq/L), CH3COO- (5.9μeq/L), C2O42- (3.9μeq/L) and HCOO- (3.7μeq/L) accounted for 8.5% of total anions, much higher than those in Shanghai rainwaters. Ca2+ (19.2μeq/L, 4.0%) and Mg2+ (4.9μeq/L, 1.0%) were two or three orders of magnitude lower than those detected in fogwaters. The ion concentration changed more appreciably as a function of time, in close association with photochemical reaction, inversion layer in spring, and so forth.
王廷祥, 陈建民. 上海大气冷凝水化学特性分析[J]. 中国环境科学, 2013, 33(1): 1-8.
WANG Ting-Xiang, CHEN Jian-Min. Analyses on chemical characteristic of air condensation water in Shanghai. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(1): 1-8.