Chloride analysis in magnesium metal using ion chromatography with conductometric detection

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Accurate chloride determination is crucial for magnesium metal quality control.
• Existing methods may lack simplicity, speed, or accuracy.

Purpose of the Study:

• To develop a simple, rapid, and accurate method for chloride determination in magnesium metal.
• To validate the method's performance characteristics, including detection limit and precision.

Main Methods:

• Chloride was quantified using anion exchange chromatography with conductometric detection.
• A Metrosep Anion Dual 2 column and Metrosep RP guard column were employed.
• A mobile phase of sodium carbonate and sodium bicarbonate was used for elution.

Main Results:

• The method achieved a limit of detection of 50 mg kg(-1) for chloride.
• The overall relative standard deviation was 5%, indicating good precision.
• Chloride recovery ranged from 99-102%, demonstrating high accuracy.
• No significant interference was observed from system or nitrate peaks.

Conclusions:

• The developed anion exchange chromatography method is effective for simple, rapid, and accurate chloride determination in magnesium metal.
• The method's low detection limit, high recovery, and precision make it suitable for quality control applications.