Carbonyl collection efficiency of the DNPH-coated C-18 cartridge in dry air and in humid air
Carbonyl collection efficiency of the DNPH-coated C-18 cartridge in dry air and in humid air
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DOI：
10.1021/es950297e
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发表时间：
1996-03-01
影响因子：
11.4
通讯作者：
Grosjean, D
中科院分区：
文献类型：
--
作者：
Grosjean, E;Grosjean, D
DNPH 涂层 C-18 滤芯在 ppb-ppm 级羰基化合物采样方面的性能已在干燥空气 (RH = 3-7%) 和潮湿空气 (RH = 55 +/- 10%) 中进行了测试。在潮湿空气中，滤筒（上游）-冲击器（下游）采样序列的实验表明滤筒没有突破，并且测量浓度和标称浓度之间存在良好的一致性。在干燥空气中，酮的测量浓度与标称浓度之间具有良好的一致性，但醛的浓度则不然。对于臭氧-烯烃实验中作为反应产物原位产生的羰基化合物，酮在干燥空气和潮湿空气中的形成产率相同，但醛（尤其是甲醛）在干燥空气中的形成产率低于潮湿空气中的产率。对于约。研究了 20 种羰基化合物，结果表明，在潮湿空气中对羰基化合物进行采样时，DNPH 涂层的 C-18 滤芯性能良好，而在非常干燥的空气中对醛类（尤其是甲醛）进行采样时，性能较差。简要讨论了结果的含义。
The performance of the DNPH-coated C-18 cartridge with respect to sampling of ppb-ppm levels of carbonyls has been tested in dry air (RH = 3-7%) and in humid air (RH = 55 +/- 10%). In humid air, experiments with cartridge (upstream)-impinger (downstream) sampling trains indicated no cartridge breakthrough, and good agreement was found between measured and nominal concentrations. In dry air, there was good agreement between measured and nominal concentrations for ketones but not for aldehydes. For carbonyls produced in-situ as reaction products in ozone-alkene experiments, formation yields in dry air and humid air were the same for ketones but were lower in dry air than in humid air for aldehydes, especially for formaldehyde. For the ca. 20 carbonyls studied, the results indicate good performance of the DNPH-coated C-18 cartridge when sampling carbonyls in humid air and poor performance when sampling aldehydes, especially formaldehyde, in very dry air. Implications of the results are briefly discussed.