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Compact Fluorescence Spectrometer with Built-In In-Line Calibration: Application to Detect Dissolved Organic Matter

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A new compact fluorescence spectrometer (FS) uses an in-line spectral calibration sheet (ISCS) for improved accuracy. This novel device offers enhanced detection limits and simplifies spectral calibration for component analysis.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Fluorescence spectrometers (FS) are vital for component analysis due to unique material spectra.
  • Traditional spectral calibration methods are complex and require bulky equipment.
  • There is a need for more compact and accurate FS systems.

Purpose of the Study:

  • To develop a compact fluorescence spectrometer with simplified, in-line spectral calibration.
  • To improve the accuracy and sensitivity of fluorescence-based detection.
  • To enable effective compensation for spectral interferences and instrument drift.

Main Methods:

  • Integration of a narrow band-pass filter and a linear variable filter (LVF) into an in-line spectral calibration sheet (ISCS).
  • Fabrication of a compact FS apparatus (ISCS-FS) utilizing UV-LED excitation, a metal capillary (MC), and the ISCS.
  • Application of transmitted excitation power (TEP) calibration for simultaneous compensation of primary inner filter effect (PIFE) and UV-LED power drift.

Main Results:

  • The ISCS-FS demonstrated a significant improvement in the linear correlation coefficient of signal concentration from 0.89 to 0.998.
  • Relative standard deviation (RSD) for replicated detection was reduced from 3% to 0.7%.
  • Achieved a detection limit of concentration (DLC) of 1.3 μg/L, a 15-fold improvement over commercial FS and comparable to TOC analyzers.

Conclusions:

  • The developed ISCS-FS offers a compact, accurate, and sensitive platform for fluorescence-based analysis.
  • In-line spectral calibration effectively compensates for PIFE and instrument drift, enhancing reliability.
  • The ISCS-FS presents a cost-effective and portable alternative to bulky commercial instruments for specific applications.