Yang Yongjie, Zhou Rui, Yu Yue, Yan Yan, Liu Yan, Di Yi'an, Wu Dan, Zhang Weiqi
National Research Center for Environmental Analysis and Measurement, Beijing 100029, China.
National Research Center for Environmental Analysis and Measurement, Beijing 100029, China.
J Environ Sci (China). 2017 May;55:146-156. doi: 10.1016/j.jes.2016.07.012. Epub 2016 Aug 27.
The characteristics of water-soluble ions in size-resolved particulate matter were investigated using ion chromatography at Shangdianzi, a regional background station of Beijing, Tianjin, and Hebei. Seasonal total concentrations of ions (Na, Mg, K, Ca, NH, Cl, SO and NO) were 75.5±52.9μg/m in spring, 26.5±12.3μg/m in summer, 22.7±20.4μg/m in autumn, and 31.1±23.9μg/m in winter, respectively. The secondary ions (NO, SO and NH), mainly associated with fine particles, accounted for 84.2% in spring, 82.1% in summer, 81.5% in autumn and 76.3% in winter of all ions. Strong correlations were found between NH and SO (r=0.95, p<0.01) as well as NH and NO (r=0.90, p<0.01) in fine particles; while in coarse particles, correlations between Mg and NO (r=0.80, p<0.01), and Ca and NO (r=0.85, p<0.01) were found. The concentrations of Na, K, Mg, Ca, NH, Cl, NO, and SO were 2.02, 0.81, 0.36, 1.65, 9.58, 4.01, 18.9, and 18.4μg/m in particulate matter from southeast-derived air masses, which were typically 1.58-3.37 times higher than in northwest trajectories. Thus, concentrations of water-soluble ions at this background station were heavily influenced by regional transport of serious pollution derived from biomass burning, coal combustion, industrial and vehicle exhaust emissions from Beijing, Tianjin, and Hebei.
利用离子色谱法，对京津冀区域本底站——上甸子大小分辨颗粒物中水溶性离子的特征进行了研究。离子（Na、Mg、K、Ca、NH、Cl、SO和NO）的季节性总浓度在春季为75.5±52.9μg/m，夏季为26.5±12.3μg/m，秋季为22.7±20.4μg/m，冬季为31.1±23.9μg/m。主要与细颗粒物相关的二次离子（NO、SO和NH）在所有离子中所占比例春季为84.2%，夏季为82.1%，秋季为81.5%，冬季为76.3%。在细颗粒物中，NH与SO（r=0.95，p<0.01）以及NH与NO（r=0.90，p<0.01）之间存在很强的相关性；而在粗颗粒物中，发现Mg与NO（r=0.80，p<0.01）以及Ca与NO（r=0.85，p<0.01）之间存在相关性。来自东南气流的颗粒物中Na、K、Mg、Ca、NH、Cl、NO和SO的浓度分别为2.02、0.81、0.36、1.65、9.58、4.01、18.9和18.4μg/m，通常比西北气流轨迹中的浓度高1.58 - 3.37倍。因此，该本底站水溶性离子的浓度受到来自京津冀地区生物质燃烧、煤炭燃烧、工业和机动车尾气排放等严重污染区域传输的严重影响。
