Chemical characteristics and influence of continental outflow on PM1.0, PM2.5 and PM10 measured at Tuoji island in the Bohai Sea.
Chemical characteristics and influence of continental outflow on PM1.0, PM2.5 and PM10 measured at Tuoji island in the Bohai Sea.
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DOI：
10.1016/j.scitotenv.2016.08.146
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
Junmei Zhang;Lingxiao Yang;A. Mellouki;L. Wen;Yumeng Yang;Ying Gao;Pan Jiang;Yanyan Li;Wen-xing Wang
中科院分区：
文献类型：
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作者：
Junmei Zhang;Lingxiao Yang;A. Mellouki;L. Wen;Yumeng Yang;Ying Gao;Pan Jiang;Yanyan Li;Wen-xing Wang
为了研究本底区域颗粒物的化学特征和来源，于2014年冬季在托集岛采集了PM1.0、PM2.5和PM100样品。测定了土壤中Na+、NH_4~+、K~+、Mg~(2+)、Ca~(2+)、Cl~(2+)、−、NO_3~(2-)−和SO_4~(2+)、−、有机碳(OC)、元素碳(EC)和水溶性有机碳(WSOC)的含量。PM1.0、PM2.5和PM10的平均质量浓度分别为44.5g/m~3、62.0g/m~3和94.4g/m~3，颗粒物在μ_(1.0)中有重要的富集作用。次生WSII(NH_4~+、NO_3~-−和SO_4~(2+)、−)含量最高，在PM1.0中贡献率最高。PM1.0的NOR和SOR平均值均大于0.1，说明PM1.0存在气体前体SO2和NO2的二次生成SO42、−和NO3−。有机碳PM1.0中次生有机碳占62.3%，PM1.0-2.5中次生有机碳占61.9%，PM2.5-10O中次生有机碳占48.9%，主要以细粒形式形成。颗粒物浓度主要受来自中国平原北部的气团影响，特别是来自低速低空的鲁西南地区的气团。
To investigate the chemical characteristics and sources of size-segregated particles in the background region, PM1.0, PM2.5and PM10samples were collected in Tuoji Island (TI) during the winter of 2014. Water-soluble inorganic ions (WSIIs) including Na+, NH4+, K+, Mg2 +, Ca2 +, Cl−, NO3−and SO42 −, organic carbon (OC) and elemental carbon (EC) and water-soluble organic carbon (WSOC) were analysed. The average mass concentrations of PM1.0, PM2.5and PM10were 44.5 μg/m3, 62.0 μg/m3and 94.4 μg/m3, respectively, and particles were importantly enriched in PM1.0. Secondary WSIIs (NH4+, NO3−and SO42 −) were the most abundant species, and their contribution was highest in PM1.0. The average values of NOR and SOR were more than 0.1 in PM1.0, suggesting that secondary formation of SO42 −and NO3−from the gas precursors SO2and NO2occurred in PM1.0. Secondary organic carbon accounted for 62.3% in PM1.0, 61.9% in PM1.0–2.5and 48.9% in PM2.5–10of OC, formed mainly in the fine mode. The particles concentrations were mainly affected by air mass from the North China Plain, especially the air mass from the southwest of Shandong province, which had low speed and altitude.