Simplified paired-emitter-detector-diodes-based photometry with improved sensitivity.

Area of Science:

• Analytical Chemistry
• Optical Sensing
• Instrument Development

Background:

• Photometric measurements are crucial in various analytical fields.
• Existing optical detectors can be complex and expensive.
• There is a need for cost-effective and sensitive detection methods.

Purpose of the Study:

• To characterize paired emitter-detector diodes (PEDDs) as complete instruments for photometric measurements.
• To evaluate PEDDs as optical flow-through detectors.
• To demonstrate the application of PEDDs for sensitive analyte detection.

Main Methods:

• Characterization of PEDDs coupled with a potentiometric pH-meter and a multimeter.
• Utilizing paired red LEDs for the determination of bromothymol blue (BTB) as a model analyte.
• Analysis of analytical characteristics including linearity and sensitivity.

Main Results:

• Developed PEDD instruments enable rapid and sensitive BTB detection in the ppm range.
• PEDDs coupled with a pH-meter show wide linearity of response.
• PEDDs coupled with a voltmeter significantly enhance detection sensitivity.

Conclusions:

• PEDDs are effective and versatile instruments for common photometric and optical flow-through detection.
• The developed system offers a sensitive and cost-effective solution for analytical and bioanalytical measurements.
• Further applications in various analytical and bioanalytical fields are indicated.