科研之友
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摘要
Chlorine is a powerful oxidizing agent extensively used in water disinfection and blanching processes. Too low or too high chlorine concentration in water supplies would cause hazards for water usage. In this work, a miniaturized microfluidic evanescent-wave sensor was developed for colorimetric determination of free chlorine in water. A microfluidic channel with narrow d(c) (50 mu m) was constructed to act as both flow cell and detection cell in this sensor. When light propagated by total internal reflection (TIR) in the fiber core, evanescent wave produced on the fiber surface could interact with the DPD reagents and produce absorption change. The free chlorine could be determinated by colorimetric method and evaluated by absobance according to Beer's law. This miniaturized sensor showed improved performances of small detection volume (1.2 mu L), fast analysis (4.42 s), low detection limit (1.5 ppb) and excellent repeatability (1.59%) for chlorine determination. The sensor was applied to chlorine determination in different water samples. The results obtained were compared with those obtained by conventional spectrophotometry and iodometry, showing agreement and validating the sensor's potential applications. Meanwhile, the fabrication of this sensor provides a miniaturized and portable detection platform for other hazardous species monitoring by simple modular design.
- 出版日期2017-6
- 单位西南石油大学
