Matrix solid phase dispersion-assisted BCR sequential extraction method for metal partitioning in surface estuarine...

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Sedimentology

Background:

• The Community Bureau of Reference (BCR) sequential extraction scheme is crucial for understanding metal partitioning in estuarine sediments.
• Conventional BCR methods are time-consuming and can involve hazardous procedures, particularly for organic matter oxidation.
• Developing faster and safer analytical techniques is essential for effective environmental monitoring.

Purpose of the Study:

• To accelerate the BCR sequential extraction scheme for metal partitioning in estuarine sediments.
• To implement and optimize a matrix solid phase dispersion (MSPD) approach for BCR analysis.
• To evaluate the accuracy and repeatability of the MSPD-assisted BCR method.

Main Methods:

• Utilized a matrix solid phase dispersion (MSPD) approach with sea sand as the dispersing agent within a disposable syringe.
• Adapted the conventional BCR protocol extractants (acetic acid, hydroxylammonium chloride, hydrogen peroxide, ammonium acetate) for the MSPD procedure.
• Optimized variables for the three stages of BCR extraction and employed Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) for elemental detection.

Main Results:

• The MSPD-assisted BCR procedure significantly accelerated the analysis, particularly for the exchangeable (first) and oxidizable (third) fractions.
• Accurate results were achieved for the first and third stages, with good repeatability (RSDs generally <10%).
• The method demonstrated good accuracy when analyzing certified reference materials (CRM 601 and CRM 701) for target metals.

Conclusions:

• The MSPD-assisted BCR method provides a faster, safer, and accurate alternative for metal partitioning analysis in estuarine sediments.
• This approach successfully overcomes the limitations of conventional BCR methods, especially regarding organic matter oxidation.
• The developed technique is suitable for routine environmental analysis and monitoring of metal contamination in sediments.