摘要
通过硅烷化试剂(Bis(trimethylsilyl)trifluoroacetamide,BSTFA)衍生化反应和气相色谱-质谱(gas chromatograph-mass spectrometer,GC-MS)分析,对上海市宝山(郊区)和徐家汇(市区)两地点大气PM2.5中的糖类化合物进行了定性和定量分析.结果表明,大气PM2.5气溶胶中的糖类化合物主要以脱水糖类、单糖类和糖醇类化合物为主,其中两个站点糖类化合物总质量浓度的年平均值分别为340 ng/m3和268 ng/m3.相关性分析和正定矩阵因子分析(positive matrix factor analysis,PMF)的结果显示,生物质燃烧是阿拉伯醇的主要来源,而葡萄糖和果糖主要来源于土壤的再悬浮.土壤有机质对PM2.5中水溶性有机质的贡献在春夏季较高(6%～10%),而秋冬季较低,这表明来自土壤(扬尘)的有机质在春夏季时对大气细颗粒物的吸湿性、大气能见度以及灰霾的形成有较大的影响.
Saccharide compounds in the PM2.5 samples collected at Baoshan and Xujiahui of Shanghai were quantified with GC-MS. The results show that saccharides in PM2.5 were mainly comprised of anhydro sugars, monosaccharides and sugar alcohols. The annual average concentrations of total saccharides at Baoshan and Xujiahui were 340 ng/m3 and 268 ng/m3, respectively. The analysis of correlations and positive matrix factorization indicates that the main source of arabitol in PM2.5 in Shanghai was biomass burning, while glucose and fructose came from re-suspended soils. Contributions of soil organics to the total water-soluble organics in PM2.5 were higher in spring and summer （6%-10%） than that in the fall and winter, suggesting that organics from soil in spring and summer had significant impact on hygroscopicity of airborne fine particles, atmospheric visibility and the formation of haze.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第4期387-392,共6页
Journal of Shanghai University:Natural Science Edition
基金
国家自然科学基金资助项目(41173097)
上海市教委科研创新基金资助项目(12YZ027)
上海市重点学科建设资助项目(S30109)
关键词
硅烷化试剂
气相色谱-质谱
PM2
5
糖类化合物
来源分析
Bis （trimethylsilyl） trifiuoroacetamide （BSTFA）
gas chromatograph-mass spectrometer （GC-MS）
PM2.5
saccharides
source apportionment
