Amperometric enzyme-based gas sensor for formaldehyde:: Impact of possible interferences
Amperometric enzyme-based gas sensor for formaldehyde:: Impact of possible interferences
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DOI：
10.3390/s8031351
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发表时间：
2008-03-01
期刊：
影响因子：
3.9
通讯作者：
Moos, Ralf
中科院分区：
文献类型：
--
作者：
Achmann, Sabine;Haemmerle, Martin;Moos, Ralf
在这项工作中，交叉敏感性和环境的影响，灵敏度和功能的酶为基础的安培传感器系统直接检测甲醛从气相中进行了研究。该传感器在测试范围（0-15 vppm）内显示出甲醛的线性响应曲线，灵敏度为1.9 μ A/ppm，检测限约为130 ppb。环境气体如CO2，CO，NO，H-2和有机溶剂如甲醇和乙醇的蒸气的交叉灵敏度进行评估，以及温度和湿度对传感器系统的影响。传感器对CO、H-2、甲醇或乙醇以及测试气体的湿度变化均未显示出显著信号。正如预期的那样，温度变化对传感器灵敏度的影响最大，在25-30 ℃范围内，传感器信号的变化高达5 vppm CH 2 O信号的10%。
In this work, cross-sensitivities and environmental influences on the sensitivity and the functionality of an enzyme-based amperometric sensor system for the direct detection of formaldehyde from the gas phase are studied. The sensor shows a linear response curve for formaldehyde in the tested range (0-15 vppm) with a sensitivity of 1.9 mu A/ppm and a detection limit of about 130 ppb. Cross-sensitivities by environmental gases like CO2, CO, NO, H-2, and vapors of organic solvents like methanol and ethanol are evaluated as well as temperature and humidity influences on the sensor system. The sensor showed neither significant signal to CO, H-2, methanol or ethanol nor to variations in the humidity of the test gas. As expected, temperature variations had the biggest influence on the sensor sensitivity with variations in the sensor signal of up to 10% of the signal for 5 vppm CH2O in the range of 25-30 degrees C.