A compact flow-batch analyzer equipped with mini piezoelectric pumps and image-based volume control

Area of Science:

• Analytical Chemistry
• Environmental Science
• Instrumentation Engineering

Background:

• Flow-batch (FB) analyzers require precise volume control for accurate quantitative analysis.
• Traditional FB systems often rely on high-efficiency pumps and valves, necessitating frequent recalibrations.
• Exploring simpler, more accurate volume control methods is crucial for advancing FB analyzer technology.

Purpose of the Study:

• To develop a compact Flow-Batch (FB) analyzer utilizing piezoelectric micropumps and image-based detection for volume control.
• To evaluate the instrument's performance in quantitative determination of specific analytes in water samples.
• To demonstrate the feasibility of digital image monitoring as an alternative for volume control in FB systems.

Main Methods:

• Development of a compact FB analyzer incorporating piezoelectric micropumps.
• Implementation of image-based detection for precise solution volume control.
• Quantitative determination of Cr(VI), NO2-, and Fe(II) using RGB-based colorimetry and spectrophotometry with standard addition calibration.

Main Results:

• The developed FB analyzer successfully quantified Cr(VI), NO2-, and Fe(II) in water samples.
• Analyses, including five standard additions, were completed in approximately 10 minutes.
• High linear correlation (R2 > 0.99) and acceptable precision (0.4% ≤ RSD ≤ 12.1%) were achieved.
• Recoveries ranged from 90% to 105%, indicating high accuracy for analyte levels below regulatory limits.

Conclusions:

• Digital image monitoring offers an effective and elegant alternative for controlling solution volumes in FB systems.
• The developed system eliminates the need for complex, high-precision pumps, simplifying FB analyzer design.
• The piezoelectric micropump-based FB analyzer provides accurate and rapid water quality analysis, suitable for regulatory compliance.