An MSFIA system for mercury speciation based on an anion-exchange membrane

Area of Science:

• Environmental Chemistry
• Analytical Chemistry

Background:

• Mercury speciation is crucial for environmental monitoring and risk assessment.
• Traditional methods for mercury analysis often involve complex extraction procedures and can be time-consuming.
• There is a need for more efficient and environmentally friendly analytical techniques for mercury speciation.

Purpose of the Study:

• To develop and validate a new in-line method for preconcentration, clean-up, and speciation of mercury.
• To utilize an anion-exchange membrane for selective mercury complex retention.
• To achieve high sensitivity and accuracy in mercury speciation analysis.

Main Methods:

• Utilized an anion-exchange membrane for selective retention of mercury tetrachloro complex.
• Employed a multisyringe system as a liquid driver and cold vapour atomic fluorescence detection (CV-AFS).
• Used UV irradiation for the decomposition of organic mercury to inorganic mercury.

Main Results:

• Achieved mercury recoveries close to 100% for spiked samples and certified reference material (DORM-2).
• Obtained a limit of detection (LOD) of 14 ng/L for total mercury and 16 ng/L for organic mercury.
• Demonstrated a relative standard deviation (RSD) of less than 1.3% for both total and organic mercury.

Conclusions:

• The proposed anion-exchange membrane method is effective for in-line mercury speciation.
• The method offers an environmentally friendly alternative to traditional liquid-liquid extraction.
• The system provides high sensitivity, accuracy, and efficiency for mercury analysis.