Construction of a compact spectrofluorometer/spectrophotometer system using a flexible liquid core waveguide.

Area of Science:

• Analytical Chemistry
• Optical Instrumentation
• Materials Science

Background:

• Traditional analytical instruments often require complex configurations for different measurement techniques.
• Developing sensitive and versatile analytical tools for aqueous solutions remains a key challenge in environmental and chemical monitoring.

Purpose of the Study:

• To develop a simple, sensitive, and robust instrument for both fluorimetric and spectrophotometric analyses of aqueous solutions.
• To demonstrate high performance in both analytical techniques using a single, minimally reconfigured instrument.

Main Methods:

• Construction of a liquid-core waveguide using Teflon AF-2400.
• Integration of a Charge-Coupled Device (CCD) array detection system.
• Performance evaluation for fluorimetric and spectrophotometric measurements on various analytes.

Main Results:

• Achieved fluorimetric detection limits of 0.06 nanomolar for quinine sulfate and 0.03 nanomolar for chlorophyll-a.
• Demonstrated spectrophotometric detection capacities of nanomolar for hydrogen sulfide and subnanomolar for methylene blue.
• Confirmed high performance for both techniques with minimal instrument configuration changes.

Conclusions:

• The Teflon AF-2400 liquid-core waveguide instrument provides a versatile and sensitive platform for aqueous solution analysis.
• The instrument's simplicity and robustness make it suitable for various fluorimetric and spectrophotometric applications.
• This approach offers a cost-effective and efficient alternative for chemical and environmental monitoring.