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

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-、NO₃-、SO₄2-、Na+、K+、NH₄+、Mg2+、Ca2+）及甲基磺酸盐（CH₃SO₃-，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nss-SO₄2-、NO₃-和NH₄+）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±0.012 μg/m3。来源分析结果表明，海盐硫酸盐（ss-SO₄2-）对总SO₄2-的贡献率仅为7.3%，生源硫酸盐对nss-SO₄2-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SO₄2-的主要来源。另外，气溶胶中NO₃-占无机氮的比例为62.56%～83.03%。

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

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%.