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Small-volume fiber-optic evanescent-wave absorption sensor for nitrite determination.

Yan Xiong1, Dao-qian Zhu, Chun-feng Duan

  • 1Department of Instrumentation and Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.

Analytical and Bioanalytical Chemistry
|November 11, 2009
PubMed
Summary

A new fiber-optic sensor accurately measures nitrite levels in water using the Griess-Ilosvay reaction. This innovative device offers a sensitive and reliable method for environmental water quality monitoring.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Sensor Technology

Background:

  • Nitrite is a key indicator of water quality and pollution.
  • Accurate and sensitive nitrite determination is crucial for environmental monitoring.
  • Existing methods may require complex sample preparation or are less portable.

Purpose of the Study:

  • To develop and evaluate a novel small-volume fiber-optic evanescent-wave absorption sensor for nitrite determination.
  • To assess the sensor's performance characteristics, including linearity, detection limit, and precision.
  • To validate the sensor's applicability for analyzing nitrite in various real-world water samples.

Main Methods:

  • Fabrication of a fiber-optic sensor using a decladded optical fiber within a capillary microchannel.

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  • Utilizing the Griess-Ilosvay reaction for nitrite detection, where nitrite reacts with reagents to form an azo dye.
  • Measuring the absorbance of the azo dye generated by the interaction of the evanescent wave (EW) field with the dye.
  • Parallel detector design aligned with the optical fiber axis for enhanced signal capture.

    • Main Results:

    • The sensor demonstrated a linear response of absorbance with nitrite concentration from 0.05 to 10 mg L(-1).
    • A low detection limit of 0.02 mg L(-1) (3sigma) was achieved with a relative standard deviation (RSD) of 2.6%.
    • Successful determination of nitrite in diverse water samples including mineral, tap, rain, and seawater, with results consistent with spectrophotometric methods.

    Conclusions:

    • The developed fiber-optic evanescent-wave absorption sensor is a sensitive and reliable tool for nitrite determination.
    • The sensor shows significant potential for practical applications in environmental water quality monitoring.
    • The method offers a promising alternative to conventional spectrophotometric techniques for on-site nitrite analysis.