Legendre A, Bsaibes S, Paijens C, Dugay J, Courtois Y, Cuccia L, Ballestas Castro D, Thiebaut D, Vial J
LSABM, UMR CBI 8231CNRS, ESPCI Paris, PSL Université, 10 rue Vauquelin, Paris, 75005, France.
RICE (Research and Innovation Center for Energy), GRTgaz, 1-3 rue du Commandant Estienne d'Orves, Villeneuve la Garenne, 92390, France.
Anal Bioanal Chem. 2024 Dec;416(29):7019-7029. doi: 10.1007/s00216-024-05604-2. Epub 2024 Oct 21.
In the context of the energy transition and in order to fully manage the integration of renewable and/or low-carbon gases into the gas mix, these new renewable gases need to be characterized, including volatile organic compounds (VOCs) at trace levels that may have an impact on different stages of the gas chain event at low concentrations. This study focuses on sampling because it is the first step in any method for analyzing trace VOCs and its careful execution is essential to ensure reliable results even if the on-site conditions can be variable, such as the external temperature. The stabilization time, the effect of external temperature, and the impact of using an intermediate sample cylinder prior to transfer to tubes were hence studied in the laboratory using a standard gas mixture representative of renewable gases. The latter was also studied using a real sample. To perform this study, VOCs were sampled in Tenax® TA tubes and then analyzed by thermal desorption hyphenated to comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry. The results showed that 45 min were required to stabilize the sampling system and that external temperature had little influence, limited to the heaviest compounds. Finally, the use of a cylinder to temporarily collect gas prior to transfer to tubes led to a loss of compounds, particularly when the cylinder was stored before the transfer.
在能源转型的背景下，为了全面管理可再生和/或低碳气体融入混合气体的过程，需要对这些新型可再生气体进行特性描述，包括痕量水平的挥发性有机化合物（VOCs），这些化合物在低浓度下可能会对气体链事件的不同阶段产生影响。本研究聚焦于采样，因为它是分析痕量VOCs的任何方法的第一步，并且即使现场条件可能多变，如外部温度，仔细执行采样对于确保可靠结果至关重要。因此，在实验室中使用代表可再生气体的标准气体混合物研究了稳定时间、外部温度的影响以及在转移到采样管之前使用中间样品瓶的影响。还使用实际样品进行了研究。为开展这项研究，在Tenax® TA采样管中采集VOCs，然后通过热脱附联用全二维气相色谱-飞行时间质谱进行分析。结果表明，采样系统需要45分钟才能稳定，外部温度影响很小，仅限于最重的化合物。最后，在转移到采样管之前使用样品瓶临时收集气体导致化合物损失，尤其是在转移前储存样品瓶的情况下。
