Trace element quantification in solid fuel wastes by LA-ICP-MS: a review

Area of Science:

• Analytical Chemistry
• Environmental Science
• Materials Science

Background:

• Solid fuel wastes (coal fly ash, biomass char, petroleum coke) present complex matrices for elemental analysis.
• Accurate trace element determination is vital for environmental risk assessment and resource recovery.
• Existing methods struggle with the heterogeneity and compositional complexity of these wastes.

Purpose of the Study:

• To highlight the utility of Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) for analyzing trace elements in solid fuel wastes.
• To demonstrate LA-ICP-MS's capability for in situ micro-area characterization and spatial distribution mapping.
• To identify challenges and future research directions for optimizing LA-ICP-MS in this application.

Main Methods:

• Utilizing Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) for trace element determination.
• Performing in situ micro-area characterization without extensive sample preparation.
• Mapping the spatial distribution of hazardous metals (Pb, Cd, Cr) and Rare Earth Elements (REEs).

Main Results:

• LA-ICP-MS provides high sensitivity (ng/g detection limits) and spatial resolution (1-100 μm) for multi-element analysis.
• The technique successfully maps hazardous elements and REEs in heterogeneous waste matrices.
• Identified REE-enriched micro-domains in coal ash exceeding 500 μg/g.

Conclusions:

• LA-ICP-MS is a powerful tool for environmental risk assessment and resource recovery from solid fuel wastes.
• Challenges include matrix effects, calibration standard scarcity, and universal calibration limitations.
• Future work should focus on optimizing sample preparation, calibration strategies, and integrating complementary techniques for sustainable waste management.