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首页> 外文期刊>Environmental Science & Technology >Measurement Of Atmospheric Hydroxyacetone, Glycolaldehyde, And Formaldehyde
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Measurement Of Atmospheric Hydroxyacetone, Glycolaldehyde, And Formaldehyde

机译：大气中的羟丙酮，乙醇醛和甲醛的测量

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摘要

A method has been modified and optimized forthe measurements of hydroxyacetone as well as formaldehyde and glycolaldehyde, based on aqueous scrubbing using a coil sampler followed by DNPH derivatization and HPLC analysis. Derivatization equilibrium and kinetics were studied to optimize the hydroxy-acetone-DNPH derivative yield. It was found that the low sensitivity of hydroxyacetone by this method is due to a relatively small equilibrium constant for the hydroxyacetone-DNPH derivatization reaction, and thus it can be improved by increasing DNPH reagent concentration. In a medium containing 500 μM DNPH and 50 mM HCI, the derivatization reaches equilibrium within 30 min. An online reagent purification procedure using a DNPH-saturated Sep-Pak C-18 cartridge effectively removed hydrazone impurities in the DNPH reagent solution, and a sample preconcentration procedure using a C-18 guard column greatly enhanced the sensitivity and lowered the detection limits. The lower detection limits of the system under optimized conditions are 30, 9, and 36 pptv for hydroxyacetone, glycolaldehyde, and formaldehyde, respectively, with a sampling/ analysis cycle time of 30 min. The method has been successfully deployed at a rural site in Pinnacle State Park in Addison, NY, for a 5 week period during the summer of 1998. The ambient concentration means (medians) were 372 (332), 301 (323), and 2040 (2030) pptv for hydroxyacetone, glycolaldehyde, and formaldehyde, respectively. A late-afternoon maximum and an early morning minimum were observed in the diurnal concentration distributions of all three carbonyl compounds. Good correlations among the three carbonyl compounds suggest that they originated from a common source, i.e., photochemical oxidation of biogenic hydrocarbons. Formaldehyde photolysis accounted for about 23% of the total radical photoproduction, whereas contributions from hydroxyacetone and glycolaldehyde photolysis were insignificant because of the much slower photolysis and lower concentrations of these compounds.
机译：基于使用线圈采样器进行水洗，然后进行DNPH衍生化和HPLC分析的水洗方法，已对用于测量羟丙酮以及甲醛和乙醇醛的方法进行了修改和优化。研究了衍生化平衡和动力学，以优化羟基丙酮-DNPH衍生物的收率。发现该方法对羟丙酮的敏感性低是由于羟丙酮-DNPH衍生化反应的平衡常数相对较小，因此可以通过增加DNPH试剂浓度来改善。在含有500μMDNPH和50 mM HCl的介质中，衍生化在30分钟内达到平衡。使用DNPH饱和的Sep-Pak C-18小柱进行在线试剂纯化的程序可有效去除DNPH试剂溶液中的impurities杂质，而使用C-18保护柱的样品预浓缩程序可大大提高灵敏度并降低检测限。在最佳条件下，该系统的下限为分别为30，9和36 pptv的羟丙酮，乙醇醛和甲醛，采样/分析循环时间为30分钟。该方法已成功地在1998年夏季的纽约州Addison的Pinnacle State Park的一个乡村地点进行了为期5周的部署。环境浓度平均值（中位数）为372（332），301（323）和2040 （2030）pptv分别用于羟基丙酮，乙醇醛和甲醛。在所有三种羰基化合物的日间浓度分布中观察到了午后最大值和清晨最小值。三种羰基化合物之间的良好相关性表明它们源自共同的来源，即生物烃的光化学氧化。甲醛的光解作用约占自由基总光生产的23％，而羟丙酮和乙醇醛光解作用的贡献则微不足道，因为这些化合物的光解速度慢得多且浓度较低。

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  • 来源
    《Environmental Science & Technology》 |2009年第8期|2753-2759|共7页
  • 作者

    XIANLIANG ZHOU; GU HUANG; KEVIN CIVEROLO; JAMES SCHWAB;

  • 作者单位

    Wadsworth Center, New York State Department of Health, School of Public Health and Atmospheric Science Research Center, State University of New York at Albany, Albany, NewYork, and New York State Department of Environmental Conservation, Albany, New York;

    Wadsworth Center, New York State Department of Health, School of Public Health and Atmospheric Science Research Center, State University of New York at Albany, Albany, NewYork, and New York State Department of Environmental Conservation, Albany, New York;

    Wadsworth Center, New York State Department of Health, School of Public Health and Atmospheric Science Research Center, State University of New York at Albany, Albany, NewYork, and New York State Department of Environmental Conservation, Albany, New York;

    Wadsworth Center, New York State Department of Health, School of Public Health and Atmospheric Science Research Center, State University of New York at Albany, Albany, NewYork, and New York State Department of Environmental Conservation, Albany, New York;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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