期刊
ANALYTICAL CHEMISTRY
卷 83, 期 12, 页码 5017-5022出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac200884z
关键词
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资金
- New Energy and Industrial Technology Development Organization (NEDO)
- Grants-in-Aid for Scientific Research [21000007] Funding Source: KAKEN
A portable, highly sensitive, and continuous ammonia gas monitoring system was developed with a microfluidic chip. The system consists of a main unit, a gas pumping unit, and a computer which serves as an operation console. The size of the system is 45 cm width x 30 cm depth x 30 cm height, and the portable system was realized. A highly efficient and stable extraction method was developed by utilizing an annular gas/liquid laminar flow. In addition, a stable gas/liquid separation method with a PTFE membrane was developed by arranging a fluidic network in three dimensions to achieve almost zero dead volume at the gas/liquid extraction part. The extraction rate was almost 100% with a liquid flow rate of 3.5 mu L/min and a gas flow rate of 100 mL/min (contact time of similar to 15 ms), and the concentration factor was 200 times by calculating the NH3 concentration (w/w unit) in the gas and liquid phases. Stable phase separation and detection was sustained for more than 3 weeks in an automated operation, which was sufficient for the monitoring application. The lower limit of detection calculated based on a signal-to-noise ratio of 3 was 84 ppt, which showed good detectability for NH3 analysis. We believe that our system is a very powerful tool for gas analysis due to the advantages of portable size, high sensitivity, and continuous monitoring, and it is particularly useful in the semiconductor field.
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