Pollmann Jan, Helmig Detlev, Hueber Jacques, Tanner David, Tans Pieter P
Institute of Arctic and Alpine Research (INSTAAR), University of Colorado, Boulder, CO 80309, USA.
J Chromatogr A. 2006 Nov 17;1134(1-2):1-15. doi: 10.1016/j.chroma.2006.08.050. Epub 2006 Sep 27.
Nine commercial solid adsorbent materials (in order of decreasing surface area: Carboxen 1000, Carbosieve S III, molecular sieve 5A, molecular sieve 4A, silica gel, Carboxen 563, activated alumina, Carbotrap and Carboxen 1016) were investigated for their ability to trap and release C2-C6 non-methane hydrocarbons (NMHCs) in atmospheric samples for subsequent thermal desorption gas chromatography-flame ionization detection analysis (GC-FID). Recovery rates for 23 NMHCs and methyl chloride (CH3Cl) were determined. A microtrap filled with the three adsorbents Carbosieve S III, Carboxen 563 and Carboxen 1016 was found to allow for the analysis of the widest range of target analytes. A detection limit of approximately 3pptC [parts per trillion (carbon)] in a 1l air sample and a linear response over a wide range of volatilities and sample volumes was determined for this configuration. Water vapor in the sample air was found to causes interference in trapping and subsequent chromatographic analysis of light NMHCs. A Peltier-cooled, regenerable water trap inserted into the sample flow path was found to mitigate these problems and to allow quantitative and reproducible results for all analytes at all tested humidity conditions.
研究了九种商用固体吸附剂材料（按表面积递减顺序排列：Carboxen 1000、Carbosieve S III、5A分子筛、4A分子筛、硅胶、Carboxen 563、活性氧化铝、Carbotrap和Carboxen 1016）捕获和释放大气样品中C2 - C6非甲烷碳氢化合物（NMHCs）的能力，以便随后进行热脱附气相色谱 - 火焰离子化检测分析（GC - FID）。测定了23种NMHCs和甲基氯（CH3Cl）的回收率。发现填充有Carbosieve S III、Carboxen 563和Carboxen 1016这三种吸附剂的微型捕集阱能够分析范围最广的目标分析物。对于这种配置，在1升空气样品中的检测限约为3pptC [万亿分之一（碳）]，并且在很宽的挥发性和样品体积范围内具有线性响应。发现样品空气中的水蒸气会对轻质NMHCs的捕集和后续色谱分析产生干扰。发现在样品流路中插入一个珀尔帖冷却的可再生水阱可以减轻这些问题，并在所有测试的湿度条件下对所有分析物获得定量且可重复的结果。
