Sequential injection system with multi-parameter analysis capability for water quality measurement.

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Accurate water quality monitoring is crucial for public health and environmental protection.
• Existing multi-parameter analysis systems can be complex and expensive.

Purpose of the Study:

• To develop a simple, cost-effective sequential injection system for simultaneous determination of iron, manganese, phosphate, and ammonium.
• To optimize the system for high throughput and precision without hardware reconfiguration.

Main Methods:

• Development of a laboratory-fabricated compact colorimeter as a detector.
• Optimization of software parameters for multi-analyte determination using sequential injection analysis (SI).
• Validation of the system using water samples from the Ping River, Thailand.

Main Results:

• Linear ranges established: 0.2-10 mg L⁻¹ (Fe, Mn) and 0.3-5.0 mg L⁻¹ (PO₄³⁻, NH₄⁺).
• Detection limits achieved: 0.01 mg L⁻¹ (Fe), 0.14 mg L⁻¹ (Mn), 0.004 mg L⁻¹ (PO₄³⁻), 0.02 mg L⁻¹ (NH₄⁺).
• High precision and recovery rates (82-119%) demonstrated in real-world water samples.

Conclusions:

• The developed SI system offers a robust and efficient solution for multi-parameter water quality assessment.
• The system's flexibility allows for adaptation to different analytical needs without hardware changes.
• This technology is suitable for routine environmental monitoring, providing reliable data with low chemical consumption.