Pei Zheyuan, Kelly Kerry E
Department of Chemical Engineering, University of Utah, Salt Lake City, UT 84112, USA.
Sensors (Basel). 2025 May 14;25(10):3096. doi: 10.3390/s25103096.
Formaldehyde is the most abundant carbonyl globally and the biggest driver of cancer risk in the United States among hazardous air pollutants. Ambient formaldehyde concentration measurements are generally sparse due to high measurement costs and limited measurement infrastructure. Recent studies have used low-cost air quality sensors to affordably improve spatial coverage and provide real-time measurements. Our previous research evaluated the laboratory performance of a low-cost electrochemical formaldehyde sensor (Sensirion SFA30) over formaldehyde concentrations ranging from 0 to 76 ppb. The sensors exhibited good linearity of response, a low limit of detection, and good accuracy in detecting formaldehyde. This study evaluated the cross-sensitivity of the SFA30 and the Gravity sensors (electrochemical formaldehyde sensors) over formaldehyde concentrations ranging from 0 to 326 ppb in a laboratory evaluation system, with broadband cavity-enhanced absorption spectroscopy used to obtain the reference measurements. We evaluated the sensors in a mixture of formaldehyde with five outdoor trace gases (CO, NO, NO, O, and isobutylene) and two indoor VOCs (methanol and isopropyl alcohol). The results suggest that the Gravity sensors may be useful for outdoor formaldehyde measurements when formaldehyde levels are well above background levels and that the SFA30 sensors may be useful screening tools for indoor environments, if properly calibrated.
甲醛是全球最丰富的羰基化合物，在美国的有害空气污染物中，它是导致癌症风险的最大因素。由于测量成本高和测量基础设施有限，环境甲醛浓度测量数据通常很稀少。最近的研究使用低成本空气质量传感器，以经济实惠的方式扩大空间覆盖范围并提供实时测量。我们之前的研究评估了一种低成本电化学甲醛传感器（Sensirion SFA30）在0至76 ppb甲醛浓度范围内的实验室性能。这些传感器在检测甲醛时表现出良好的响应线性、低检测限和高准确度。本研究在实验室评估系统中，对SFA30和Gravity传感器（电化学甲醛传感器）在0至326 ppb甲醛浓度范围内的交叉敏感性进行了评估，使用宽带腔增强吸收光谱法获取参考测量值。我们在甲醛与五种室外痕量气体（一氧化碳、一氧化氮、二氧化氮、臭氧和异丁烯）以及两种室内挥发性有机化合物（甲醇和异丙醇）的混合物中对这些传感器进行了评估。结果表明，当甲醛水平远高于背景水平时，Gravity传感器可能适用于室外甲醛测量；如果校准得当，SFA30传感器可能是室内环境有用的筛选工具。
