Turbidimetric detection method in flow-assisted separation of dispersed samples

Area of Science:

• Analytical Science
• Chromatography
• Spectrophotometry

Background:

• Characterizing dispersed samples is crucial in analytical science.
• Common techniques include size exclusion chromatography, hydrodynamic chromatography, and field-flow fractionation.
• UV/vis spectrophotometric detectors often function as turbidimeters for dispersed analytes, requiring knowledge of extinction properties for quantification.

Purpose of the Study:

• To develop a novel method for experimentally obtaining the mass-size (or number-size) distribution function of dispersed analytes.
• To enable direct quantitative analysis without relying on standards or predicting optical properties.
• To validate the method's accuracy and robustness through simulations and experimental application.

Main Methods:

• Utilizing single-run, flow-assisted separation with UV/vis diode-array detectors.
• Employing a known retention-to-size relationship (theoretical or empirical).
• Developing and testing original algorithms for data processing and numerical optimization.

Main Results:

• The proposed method experimentally determines the mass-size distribution function.
• The approach bypasses the need for analyte standards or optical property prediction.
• Simulations demonstrate accuracy and robustness, with successful application to field-flow fractionation data.

Conclusions:

• The novel method provides a direct route to quantitative analysis of dispersed samples.
• It offers a significant advancement over existing techniques by simplifying data interpretation.
• The method is validated and applicable to real-world analytical challenges, particularly in field-flow fractionation.