Solid state and sub-cooled liquid vapour pressures of substituted dicarboxylic acids using Knudsen Effusion Mass Spectrometry (KEMS) and Differential Scanning Calorimetry
Solid state and sub-cooled liquid vapour pressures of substituted dicarboxylic acids using Knudsen Effusion Mass Spectrometry (KEMS) and Differential Scanning Calorimetry
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DOI：
10.5194/acp-10-4879-2010
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发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
Percival, C. J.
中科院分区：
文献类型：
--
作者：
Booth, A. M.;Barley, M. H.;Percival, C. J.
在20K(298-318K)范围内，用克努森扩散质谱仪(KEMS)测量了一些对大气具有重要意义的取代二元酸的固体蒸汽压。利用差示扫描量热法(DSC)得到的熔融热焓和熔点来计算过冷液体蒸汽压。它们已经与E-AIM网站上使用的估计方法进行了比较。这些方法被证明不能很好地代表-OH基团与COOH基团的结合。进行了分配计算，以说明与使用实验数据相比，不同的估算方法对有机气溶胶质量的影响。
Solid state vapour pressures of a selection of atmospherically important substituted dicarboxylic acids have been measured using Knudsen Effusion Mass Spectrometry (KEMS) over a range of 20 K (298-318 K). Enthalpies of fusion and melting points obtained using Differential Scanning Calorimetry (DSC) were used to obtain sub-cooled liquid vapour pressures. They have been compared to estimation methods used on the E-AIM website. These methods are shown to poorly represent - OH groups in combination with COOH groups. Partitioning calculations have been performed to illustrate the impact of the different estimation methods on organic aerosol mass compared to the use of experimental data.