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Effect of Ammonia on the Volatility of Organic Diacids

机译：氨对有机二酸挥发性的影响

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摘要

The effect of ammonia on the partitioning of two dicarboxylic acids, oxalic (C2) and adipic (C6) is determined. Measurements by a tandem differential mobility analysis system and a thermodenuder (TD-TDMA) system are used to estimate the saturation vapor pressure and enthalpy of vaporization of ammonium oxalate and adipate. Ammonia dramatically lowered the vapor pressure of oxalic acid, by several orders of magnitude, with an estimated vapor pressure of 1.7 ± 0.8 × 10~(-6) Pa at 298 K. The vapor pressure of ammonium adipate was 2.5 ± 0.8 × 10~(-5) Pa at 298 K, similar to that of adipic acid. These results suggest that the dominance of oxalate in diacid concentrations measured in ambient aerosol could be attributed to the salt formation with ammonia.
机译：确定了氨对草酸（C2）和己二酸（C6）这两种二元羧酸分配的影响。通过串联差分迁移率分析系统和热剥蚀器（TD-TDMA）系统进行的测量可用于估算草酸铵和己二酸铵的饱和蒸气压和蒸发焓。氨将草酸的蒸气压大大降低了几个数量级，在298 K时估计蒸气压为1.7±0.8×10〜（-6）Pa。己二酸铵的蒸气压为2.5±0.8×10〜 （-5）在298 K时的Pa，类似于己二酸。这些结果表明，在环境气溶胶中测得的草酸在二酸浓度中的优势可能归因于与氨形成的盐。

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  • 来源
    《Environmental Science & Technology》 |2014年第23期|13769-13775|共7页
  • 作者

    Andrea L. Paciga; Ilona Riipinen; Spyros N. Pandis;

  • 作者单位

    Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States;

    Department of Applied Environmental Science & Bert Bolin Center for Climate Research, Stockholm University, Stockholm SE-10691, Sweden;

    Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States,Institute of Chemical Engineering Sciences, FORTH, Patras GR-26504, Greece;

  • 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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  • 正文语种 eng
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