首页> 外文期刊>Journal of chromatography, A: Including electrophoresis and other separation methods >Generation of sub-ppb level vapor phase mixtures of biogenic volatile organic compounds from liquid phase standards and stepwise characterization of their volatilization properties by thermal desorption-gas chromatography-mass spectrometry
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Generation of sub-ppb level vapor phase mixtures of biogenic volatile organic compounds from liquid phase standards and stepwise characterization of their volatilization properties by thermal desorption-gas chromatography-mass spectrometry

机译:从液相标准物中生成亚ppb级的生物挥发性有机化合物的气相混合物,并通过热脱附-气相色谱-质谱法逐步表征其挥发性。

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In the analysis of biogenic volatile organic compounds (BVOCs) in ambient air, preparation of a sub-ppb level standard is an important factor. This task is very challenging as most BVOCs (e.g., monoterpenes) are highly volatile and reactive in nature. As a means to produce sub-ppb gaseous standards for BVOCs, we investigated the dynamic headspace (HS) extraction technique through which their vapors are generated from a liquid standard (mixture of 10 BVOCs: (1) alpha-pinene, (2) beta-pinene, (3) 3-carene, (4) myrcene, (5) alpha-phellandrene, (6) alpha-terpinene, (7) R-limonene, (8) gamma-terpinene, (9) p-cymene, and (10) Camphene) spiked into a chamber-style impinger. The quantification of BVOCs was made by collection on multiple-bed sorbent tubes (STs) and subsequent analysis by thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS). Using this approach, sub-ppb level mixtures of gaseous BVOCs were generated at different sweep cycles. The mean concentrations of 10 BVOCs generated from the most stable conditions (i.e., in the third sweep cycle) varied in the range of 0.37 +/- 0.05 to 7.27 +/- 0.86 ppb depending on the initial concentration of liquid standard spiked into the system. The reproducibility of the gaseous BVOCs generated as mixture standards, if expressed in terms of relative standard error using the concentration datasets acquired under stable conditions, ranged from 1.64 (alpha-phellandrene) to 9.67% (R-limonene). (C) 2014 Elsevier B.V. All rights reserved.
机译:在分析环境空气中的生物挥发性有机化合物(BVOC)时,制定低于ppb含量的标准是一个重要因素。由于大多数BVOC(例如单萜)本质上具有高度挥发性和反应性,因此这项任务非常具有挑战性。作为生产BVOC的亚ppb气态标样的方法,我们研究了动态顶空(HS)萃取技术,通过该技术从液体标样(10种BVOC的混合物产生:(1)α-pine烯,(2)β -pine烯,(3)3-car烯,(4)月桂烯,(5)α-el烯,(6)α-萜品烯,(7)R-柠檬烯,(8)γ-萜品烯,(9)对异丙基, (10)坎佩恩(Camphene)刺入了腔室式的冲击器。 BVOC的定量通过在多床吸附剂管(ST)上收集,然后通过热脱附-气相色谱-质谱(TD-GC-MS)进行分析。使用这种方法,在不同的扫描周期内生成了气态BVOC的亚ppb级混合物。从最稳定的条件下(即在第三次扫描周期中)产生的10种BVOC的平均浓度在0.37 +/- 0.05至7.27 +/- 0.86 ppb的范围内变化,具体取决于加标到系统中的液体标准液的初始浓度。如果使用在稳定条件下获得的浓度数据集以相对标准误差表示,生成的作为混合物标准物的气态BVOC的重现性介于1.64(α-ph烯)至9.67%(R-li烯)之间。 (C)2014 Elsevier B.V.保留所有权利。

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