Development of a Low-Cost SIA-Based Analyser for Water Samples

Area of Science:

• Analytical Chemistry
• Environmental Science
• Instrumentation

Background:

• Routine water quality analysis requires efficient and reliable instrumentation.
• Existing methods can be time-consuming and labor-intensive.
• Development of automated systems can improve accuracy and throughput.

Purpose of the Study:

• To develop and evaluate an automated multiparametric water analyzer.
• To assess the system's performance using standard analytical methods.
• To determine the cost-effectiveness and suitability for routine use.

Main Methods:

• The system employed Sequential Injection Analysis (SIA) for automated sample handling.
• A photometric detection system with a tricolour RGB LED and photodiode was utilized.
• Custom Visual Basic software controlled the SIA system, LEDs, and data acquisition.

Main Results:

• The automated analyzer successfully handled up to four methods simultaneously.
• Figures of merit were satisfactory when compared against APHA standard methods.
• The total development and component cost was under US $4600.

Conclusions:

• The developed water analyzer is appropriate for routine analytical applications.
• The system demonstrates potential for expansion with additional methods and software enhancements.
• The cost-effectiveness makes it a viable option for many laboratories.