| 北京市大气气溶胶PM2.5中水溶性有机酸的测定 |
| 摘要点击 2474 全文点击 2782 投稿时间：2003-10-31 修订日期：2004-02-13 |
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| 中文关键词 PM2.5 水溶性有机酸 毛细管电泳 来源特征 |
| 英文关键词 PM2.5 water soluble organic acids capillary electrophoresis source characteristics |
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| 中文摘要 |
| 采用毛细管电泳的方法对北京大气PM2.5中低分子量二元羧酸、醛酸、酮酸和甲磺酸等10种水溶性有机酸进行了测定.方法的定量检测限为110～280 μg/L(提取液),峰面积的相对标准偏差为1.7%～6.0%,标准工作曲线的线性相关系数为0.995～0.999.北京夏、秋、冬3季10种有机酸的总量平均分别为721ng/m3、362ng/m3、325 ng/m3,浓度水平总体上与国外大城市相当.其中乙二酸的含量最为丰富.通过各种有机酸浓度的季节变化规律,简要地探讨了它们的来源特征.
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| 英文摘要 |
| Ten water soluble organic acids in PM2.5 of atmosphere in Beijing were determined by capillary electrophoresis, including low molecular weight dicarboxylic acids, aldehyde acids, ketoacids and methanesulfonic acid. The quantified detection limits ranged from 110 to 280 μg/L (extract). The precise of peak area was between 1.7% and 6.0%, and the correlation coefficients of standard curve were 0.995～0.999. The average total concentrations of the ten organic acids in summer, fall and winter were 721ng/m3, 362ng/m3 and 325 ng/m3, respectively, which were comparable with some foreign big cities. Oxalic acid was the most abundant species. By exploring seasonal variations of the acids, their source characteristics were simply discussed. |
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