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Related Experiment Videos

Flow-through optical fiber sensor for automatic sulfide determination in waters by multisyringe flow injection

Laura Ferrer1, Graciela de Armas, Manuel Miró

  • 1Department of Chemistry, Faculty of Sciences, University of the Balearic Islands, Carretera de Valldemossa, Km 7.5, E-07122 Palma de Mallorca, Spain.

The Analyst
|April 27, 2005
PubMed
Summary

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This study introduces a new automated sensor for measuring trace sulfide in water using flow injection analysis. The method offers precise and sensitive sulfide determination for environmental monitoring.

Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Sensor Technology

Background:

  • Sulfide detection is crucial for environmental water and wastewater quality assessment.
  • Existing methods for trace sulfide determination can be complex and time-consuming.
  • Automated, sensitive, and robust analytical techniques are needed for real-time monitoring.

Purpose of the Study:

  • To develop and validate a software-controlled, flow-through optical fiber sensor for trace sulfide determination.
  • To implement disk-based solid-phase pre-concentration within a multisyringe flow injection analysis (MSFIA) setup.
  • To enable automated, sensitive, and reliable analysis of sulfide in various environmental water matrices.

Main Methods:

  • Utilized a multisyringe flow injection analysis (MSFIA) system with a flow-through optical fiber diffuse reflectance sensor.

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  • Employed Fischer's coupling reaction for sulfide detection, forming methylene blue dye.
  • Incorporated disk-based solid-phase pre-concentration using an octadecyl-chemically modified (C18) disk for enhanced sensitivity.
  • Implemented a double regeneration protocol to minimize background noise and baseline drift.

    • Main Results:

    • Achieved coefficients of variation better than 0.7% at 50 µg/L.
    • Established a linear working range of 20-200 µg/L for sulfide.
    • Obtained a detection limit of 2.9 µg/L (3σblank).
    • Demonstrated an injection throughput of 8 samples per hour with a 2.9 mL pre-concentration volume.

    Conclusions:

    • The developed optosensing MSFIA method provides a robust, automated, and miniaturized solution for trace sulfide determination.
    • The system is well-suited for real-time monitoring of sulfide in diverse environmental water samples (freshwater, seawater, wastewater).
    • The combination of MSFIA, solid-phase pre-concentration, and optical sensing offers high sensitivity and reliability for environmental analysis.