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Robust Hybrid Flow Analyzer for Formaldehyde

机译：强大的甲醛混合流量分析仪

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We report fully automated self-calibrating formaldehyde analyzers relying on a hybrid flow format and include operational scheme and design details. Long-term operation is made possible with the use of syringe pumps. Four identical analyzers were built and showed low LODs of 120 pptv or better (S/N = 3) and good linearity over 0-50 ppbv HCHO concentration range (r_2 > 0.9960), all concentrations refer to 10 min averaging times. The analyzer can resume normal operation after short-term power failure with at most two cycles of data loss following restart. Good agreement between analyzers was observed for either indoor or outdoor measurements. The use of an integrated HCHO calibration source and full control by the host computer via a graphical user interface program enables the instrument to switch between zero, calibration, and sampling modes in a programmed automated manner. Detailed field data from deployment in three urban Texas locations from the summer of 2006 are presented. Features of the data, including an episode in which the HCHO concentration exceeded 50 ppbv, the highest reported ambient HCHO concentration in North America to our knowledge, are discussed in some detail.
机译：我们报告了依靠混合流格式的全自动自校准甲醛分析仪，其中包括操作方案和设计细节。使用注射泵使长期运行成为可能。建立了四个相同的分析仪，它们显示出120 pptv或更低的低LOD（S / N = 3），并且在0-50 ppbv HCHO浓度范围内（r_2> 0.9960）具有良好的线性，所有浓度均指10分钟的平均时间。短期停电后，分析仪可以恢复正常运行，重启后最多有两个数据丢失周期。在室内或室外测量中，分析仪之间观察到良好的一致性。使用集成的HCHO校准源并由主机通过图形用户界面程序进行完全控制，使仪器能够以编程的自动方式在调零，校准和采样模式之间切换。给出了从2006年夏季开始在德克萨斯州三个城市部署的详细现场数据。我们将详细讨论数据的特征，包括HCHO浓度超过50 ppbv的事件，据我们所知，这是北美报道的最高环境HCHO浓度。

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