冬季黄海西部海域气溶胶中主要水溶性离子的化学组成与特性研究

Chemical composition and characteristics of main water soluble ions in atmospheric aerosol over the western Yellow Sea during winter

基于2012年初冬采集的黄海西部海域大气总悬浮颗粒物样品(TSP),分析其中主要水溶性离子(Cl^-、NO_3^-、SO_4^(2-)、Na^+、K^+、NH_4^+、Mg^(2+)、Ca^(2+))及甲基磺酸盐(CH_3SO_3^-,MSA)的浓度水平及化学特性,并探讨人为活动对近海大气气溶胶组成的影响。分析结果显示,气溶胶中二次离子(非海盐硫酸盐nssSO_4^(2-)、NO_3^-和NH_4^+)浓度最高,占到总测定离子浓度的69.4%。同时发现Cl^-由于受人为活动的影响表现出一定程度的富集,富集因子平均值为34.6%。气溶胶样品中的MSA浓度水平较低,平均值仅为0.014±0.012μg/m^3。来源分析结果表明,海盐硫酸盐(ss-SO_4^(2-))对总SO_4^(2-)的贡献率仅为7.3%,生源硫酸盐对nss-SO_4^(2-)的贡献率为5.0%,说明人为活动输入是中国黄海大气气溶胶中SO_4^(2-)的主要来源。另外,气溶胶中NO_3^-占无机氮的比例为62.56%~83.03%。

The total suspended particulates（ TSP） samples in atmospheric aerosol were collected in western the Yellow Sea in winter 2012 to study the main water-soluble ion concentrations of Cl-,NO3-,SO42-,Na＋,K＋,NH4＋,Mg2＋,Ca2＋ and CH3SO3-（ MSA） as well as their chemical characteristics and to discuss the influence of human activities on coastal atmospheric aerosol. The results showed that the concentrations of secondary ions（ nss-SO42-,NO3- and NH4＋）in aerosol were the highest,accounting for 69. 4% of the total determined ions. At the same time,Cl-showed a certain degree of enrichment due to the influence of human activities,and the average value of enrichment factor was 34. 6%.The concentrations of MSA were relatively low,with an average of 0. 014 ± 0. 012 μg/m3. The analysis of sulfate source showed that the contribution of sea-salt sulfate was 7. 3% to the total SO42-,while biogenic sulfate accounted for 5. 0% of nss-SO42-,indicating that human input was the main source of sulfate in aerosol over the Yellow Sea during winter. In addition,the proportion of NO3- in inorganic nitrogen in aerosol is 62. 56% 83. 03%.