Solid-phase reactors in sequential injection analysis. Determination of manganese (II) in tap water and effluent...

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Manganese(II) determination is crucial for water quality assessment.
• Existing methods for manganese analysis can be time-consuming or require specialized equipment.

Purpose of the Study:

• To develop and validate a novel sequential injection system for manganese(II) determination.
• To assess the system's performance in analyzing tap water and effluent streams.

Main Methods:

• Utilized a solid-phase reactor with lead(IV) dioxide on silica gel beads for Mn(II) oxidation to MnO4-.
• Employed spectrophotometry at 526 nm for detection within a sequential injection system.
• Compared results with the standard Inductively Coupled Plasma (ICP) method.

Main Results:

• Achieved a linear range of 1-7 mg L(-1) with a detection limit of 0.62 mg L(-1).
• The system processed approximately 50 samples per hour with a relative standard deviation <3%.
• No significant statistical difference was found compared to ICP analysis for both water types.

Conclusions:

• The proposed sequential injection system provides a rapid, reliable, and accurate method for manganese(II) determination.
• This system is suitable for routine monitoring of manganese(II) in environmental water samples.
• The method offers a cost-effective and efficient alternative to conventional analytical techniques.