Yang Yongjie, Zhou Rui, Wu Jianjun, Yu Yue, Ma Zhiqiang, Zhang Lejian, Di Yi'an
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). 2015 Aug 1;34:197-205. doi: 10.1016/j.jes.2015.01.025. Epub 2015 May 28.
The characteristics of water-soluble ions in airborne particulate matter in Beijing were investigated using ion chromatography. The results showed that the total concentrations of ions were 83.7 ± 48.9 μg/m(3) in spring, 54.0 ± 17.0 μg/m(3) in summer, 54.1 ± 42.9 μg/m(3) in autumn, and 88.8 ± 47.7 μg/m(3) in winter, respectively. Furthermore, out of all the ions, NO3(-), SO4(2-) and NH4(+) accounted for 81.2% in spring, 78.5% in summer, 74.6% in autumn, and 76.3% in winter. Mg(2+) and Ca(2+) were mainly associated with coarse particles, with a peak that ranged from 5.8 to 9.0 μm. Na(+), NH4(+) and Cl(-) had a multi-mode distribution with peaks that ranged from 0.43 to 1.1 μm and 4.7 to 9.0 μm. K(+), NO3(-), and SO4(2-) were mainly associated with fine particles, with a peak that ranged from 0.65 to 2.1 μm. The concentrations of Na(+), K(+), Mg(2+), Ca(2+), NH4(+), Cl(-), NO3(-) and SO4(2-) were 2.69, 2.32, 1.01, 4.84, 16.9, 11.8, 42.0, and 44.1 μg/m(3) in particulate matter (PM) on foggy days, respectively, which were 1.4 to 7.3 times higher than those on clear days. The concentrations of these ions were 2.40, 1.66, 0.92, 4.95, 17.5, 7.00, 32.6, and 34.7 μg/m(3) in PM on hazy days, respectively, which were 1.2-5.7 times higher than those on clear days.
采用离子色谱法对北京大气颗粒物中水溶性离子的特征进行了研究。结果表明，春季、夏季、秋季和冬季离子的总浓度分别为83.7±48.9μg/m³、54.0±17.0μg/m³、54.1±42.9μg/m³和88.8±47.7μg/m³。此外，在所有离子中，NO₃⁻、SO₄²⁻和NH₄⁺在春季占81.2%，夏季占78.5%，秋季占74.6%，冬季占76.3%。Mg²⁺和Ca²⁺主要与粗颗粒相关，峰值范围为5.8至9.0μm。Na⁺、NH₄⁺和Cl⁻具有多模态分布，峰值范围为0.43至1.1μm和4.7至9.0μm。K⁺、NO₃⁻和SO₄²⁻主要与细颗粒相关，峰值范围为0.65至2.1μm。雾天颗粒物（PM）中Na⁺、K⁺、Mg²⁺、Ca²⁺、NH₄⁺、Cl⁻、NO₃⁻和SO₄²⁻的浓度分别为2.69、2.32、1.01、4.84、16.9、11.8、42.0和44.1μg/m³，分别比晴天高1.4至7.3倍。霾天PM中这些离子的浓度分别为2.40、1.66、0.92、4.95、17.5、7.00、32.6和34.7μg/m³，分别比晴天高1.2至5.7倍。
