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This study introduces liquid-phase broadband cavity enhanced spectroscopy (BBCEAS) for stopped-flow kinetics. BBCEAS significantly improves sensitivity, enabling the measurement of previously too-fast reactions.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Stopped-flow technique is crucial for studying fast liquid-phase reactions.
  • UV-visible absorption spectroscopy is the conventional detection method, but limited by sensitivity.
  • Higher sensitivity can enable the study of faster reactions by reducing reactant concentrations.

Purpose of the Study:

  • To report the first application of liquid-phase broadband cavity enhanced spectroscopy (BBCEAS) for stopped-flow kinetics.
  • To demonstrate BBCEAS's enhanced sensitivity for measuring fast reactions.
  • To compare BBCEAS with conventional UV-visible absorption spectroscopy for kinetic measurements.

Main Methods:

  • Coupling a simple, low-cost BBCEAS setup to a commercial stopped-flow instrument.
  • Performing comparative measurements using a conventional UV-visible double-beam spectrometer.
  • Studying the reaction kinetics of potassium ferricyanide with sodium ascorbate at pH 8 and 9.2.

Main Results:

  • Achieved a cavity enhancement factor (CEF) of 78 at 434 nm.
  • Obtained a minimum detectable change in absorption coefficient (αmin) of 1.35 × 10⁻⁵ cm⁻¹ Hz⁻¹/².
  • BBCEAS enabled measurement of reactions too fast for conventional methods by allowing a 30-fold decrease in reactant concentration, showing a 58-fold sensitivity improvement.

Conclusions:

  • Liquid-phase BBCEAS is a highly sensitive and effective technique for stopped-flow kinetic measurements.
  • BBCEAS offers a significant advantage over conventional spectroscopy for studying fast reactions.
  • This approach provides a cost-effective and more sensitive alternative to existing complex cavity-enhanced setups for liquid-phase kinetics.