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Sensitive Detection of Ambient Formaldehyde by Incoherent Broadband Cavity Enhanced Absorption Spectroscopy.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-01-10 , DOI: 10.1021/acs.analchem.9b04821 Jingwei Liu 1, 2 , Xin Li 1, 2, 3 , Yiming Yang 1, 2 , Haichao Wang 1 , Cailing Kuang 1 , Yuan Zhu 1 , Mindong Chen 3 , Jianlin Hu 3 , Limin Zeng 1, 2 , Yuanhang Zhang 1, 2
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-01-10 , DOI: 10.1021/acs.analchem.9b04821 Jingwei Liu 1, 2 , Xin Li 1, 2, 3 , Yiming Yang 1, 2 , Haichao Wang 1 , Cailing Kuang 1 , Yuan Zhu 1 , Mindong Chen 3 , Jianlin Hu 3 , Limin Zeng 1, 2 , Yuanhang Zhang 1, 2
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Formaldehyde (HCHO) is the most abundant atmospheric carbonyl compound and plays an important role in the troposphere. However, HCHO detection via traditional incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS) is limited by short optical path lengths and weak light intensity. Thus, a new light-emitting diode (LED)-based IBBCEAS was developed herein to measure HCHO in ambient air. Two LEDs (325 and 340 nm) coupled by a Y-type fiber bundle were used as an IBBCEAS light source, which provided both high light intensity and a wide spectral fitting range. The reflectivity of the two cavity mirrors used herein was 0.99965 (1 - reflectivity = 350 ppm loss) at 350 nm, which corresponded with an effective optical path length of 2.15 km within a 0.84 m cavity. At an integration time of 30 s, the measurement precision (1σ) for HCHO was 380 parts per trillion volume (pptv), and the corresponding uncertainty was 8.3%. The instrument was successfully deployed for the first time in a field campaign and delivered results that correlated well with those of a commercial wet-chemical instrument based on Hantzsch fluorimetry (R2 = 0.769). The combined light source based on a Y-type fiber bundle overcomes the difficulty of measuring ambient HCHO via IBBCEAS in near-ultraviolet range, which may extend IBBCEAS technology to measure other atmospheric trace gases with high precision.
中文翻译：
非相干宽带腔增强吸收光谱法灵敏检测环境甲醛。
甲醛（HCHO）是最丰富的大气羰基化合物，在对流层中起着重要作用。但是，通过传统的非相干宽带腔增强吸收光谱法（IBBCEAS）进行的HCHO检测受到光程长度短和光强度弱的限制。因此，本文开发了新的基于发光二极管（LED）的IBBCEAS以测量环境空气中的HCHO。IBBCEAS光源使用两个通过Y型光纤束耦合的LED（325和340 nm）作为IBBCEAS光源，既提供高光强度又具有宽光谱拟合范围。本文所用的两个腔镜在350 nm处的反射率为0.99965（1-反射率= 350 ppm损耗），对应于0.84 m腔内有效光程长度为2.15 km。在30秒的积分时间内，HCHO的测量精度（1σ）为380 ppbv（pptv），相应的不确定度为8.3％。该仪器在野战中首次成功部署，其结果与基于Hantzsch荧光法（R2 = 0.769）的商业化湿化学仪器的结果非常相关。基于Y型光纤束的组合光源克服了通过IBBCEAS在近紫外线范围内测量环境HCHO的困难，这可能会扩展IBBCEAS技术以高精度测量其他大气痕量气体。该仪器在野战中首次成功部署，其结果与基于Hantzsch荧光法（R2 = 0.769）的商业化湿化学仪器的结果非常相关。基于Y型光纤束的组合光源克服了通过IBBCEAS在近紫外线范围内测量环境HCHO的困难，这可能会扩展IBBCEAS技术以高精度测量其他大气痕量气体。该仪器在野战中首次成功部署，其结果与基于Hantzsch荧光法（R2 = 0.769）的商业化湿化学仪器的结果非常相关。基于Y型光纤束的组合光源克服了通过IBBCEAS在近紫外线范围内测量环境HCHO的困难，这可能会扩展IBBCEAS技术以高精度测量其他大气痕量气体。
更新日期：2020-01-10
中文翻译：
非相干宽带腔增强吸收光谱法灵敏检测环境甲醛。
甲醛（HCHO）是最丰富的大气羰基化合物，在对流层中起着重要作用。但是，通过传统的非相干宽带腔增强吸收光谱法（IBBCEAS）进行的HCHO检测受到光程长度短和光强度弱的限制。因此，本文开发了新的基于发光二极管（LED）的IBBCEAS以测量环境空气中的HCHO。IBBCEAS光源使用两个通过Y型光纤束耦合的LED（325和340 nm）作为IBBCEAS光源，既提供高光强度又具有宽光谱拟合范围。本文所用的两个腔镜在350 nm处的反射率为0.99965（1-反射率= 350 ppm损耗），对应于0.84 m腔内有效光程长度为2.15 km。在30秒的积分时间内，HCHO的测量精度（1σ）为380 ppbv（pptv），相应的不确定度为8.3％。该仪器在野战中首次成功部署，其结果与基于Hantzsch荧光法（R2 = 0.769）的商业化湿化学仪器的结果非常相关。基于Y型光纤束的组合光源克服了通过IBBCEAS在近紫外线范围内测量环境HCHO的困难，这可能会扩展IBBCEAS技术以高精度测量其他大气痕量气体。该仪器在野战中首次成功部署，其结果与基于Hantzsch荧光法（R2 = 0.769）的商业化湿化学仪器的结果非常相关。基于Y型光纤束的组合光源克服了通过IBBCEAS在近紫外线范围内测量环境HCHO的困难，这可能会扩展IBBCEAS技术以高精度测量其他大气痕量气体。该仪器在野战中首次成功部署，其结果与基于Hantzsch荧光法（R2 = 0.769）的商业化湿化学仪器的结果非常相关。基于Y型光纤束的组合光源克服了通过IBBCEAS在近紫外线范围内测量环境HCHO的困难，这可能会扩展IBBCEAS技术以高精度测量其他大气痕量气体。
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