武汉市秋季灰霾PM_(1.0)水溶性离子特征的初步研究  

Characteristics of water-soluble ions in PM_(1.0) aerosols of Wuhan:A case study of an autumn haze episode

作　　者：吕效谱[1] 成海容[1] 王祖武[1] 张帆[1] 刘佳[1] 

机构地区：[1]武汉大学资源与环境科学学院环境工程系,湖北武汉430072

出　　处：《地球化学》2014年第3期208-216,共9页Geochimica

基　　金：国家自然科学基金(41103061);博士点基金(20110141120015);国家重点基础研究发展计划项目(2011CB707106)

摘　　要：为研究武汉市灰霾期间亚微米级细粒子(PM1.0)中水溶性离子特征,于2012年9月10日至10月30日期间,利用KS-303采样器,在武汉市郊区进行PM1.0常规/灰霾采样。使用离子色谱分析仪对采集的13个样品的10种水溶性离子(F–、Cl–、NO–3、NO–2、SO2–4、Na+、NH+4、K+、Mg2+和Ca2+)进行分析。结果显示,灰霾期PM1.0平均浓度101μg/m3,比非灰霾期高出81%左右;总水溶性离子(TWSI)平均浓度49.5μg/m3,比非灰霾期高出61%左右;SO2–4在灰霾期与非灰霾期浓度均最高,分别达到22.9μg/m3和14.8μg/m3,其次是NO–3和NH+4,灰霾期间K+和Cl–百分含量有较明显升高;秋季PM1.0呈酸性且酸性强弱与PM1.0浓度有很好的正相关性;PM1.0中水溶性离子主要来自人为源,建筑扬尘和风沙尘也对其有一定贡献。To investigate characteristics of water-soluble ions in ambient submicron aerosol particles （PM1.0） during an autumn haze episode in Wuhan, 13 samples were collected in suburb of Wuhan using KS-303 sampler from September 10th 2012 to October 30th 2012 covering normal and haze sampling campaign. Ion-chromatographic analyzer was applied for determining water soluble ions consisting of F-, Cl-, NO-3 , NO-2 , SO2-4 , Na＋, NH＋4 , K＋, Mg2＋ and Ca2＋. The mean mass concentrations of PM1.0 and total water soluble ions （TWSI） during haze period were 101 μg/m3 and 49.6 μg/m3, approximately 81% and 61% higher than those of normal period, respectively. SO2-4 exhibited the absolutely highest concentrations in both haze and normal period reaching 22.9 μg/m3 and 14.8 μg/m3, respectively, which followed by NO-3 and NH＋4 . Mass proportion of K＋and Cl-increased obviously during haze sampling. PM1.0 atmospheric aerosol was identified to be acidic in autumn of Wuhan, and positive correlations was found between acidity and mass concentrations of PM1.0. Principal component analysis （PCA） was used for identification and evaluation of contributions of emission sources to water soluble ions in PM1.0. Anthropogenic sources were identified to be the most significant, and construction dusts and karaburans also made some contributions.

关 键 词：PM1 0 水溶性离子 离子平衡 人为源 

分 类 号：P597[天文地球—地球化学]