Simple and cost-effective methods for precise analysis of trace element abundances in geological materials with...

Area of Science:

• Geochemistry
• Analytical Chemistry

Background:

• Inductively Coupled Plasma Mass Spectrometry (ICP-MS) is vital for trace element analysis in geological materials.
• Challenges include incomplete sample digestion, isobaric interferences, and instrumental drift, hindering accurate results.

Purpose of the Study:

• To develop practical, cost-effective methods for precise and rapid trace element determination using ICP-MS.
• To address and resolve common analytical challenges in geological sample analysis.

Main Methods:

• Optimized high-pressure digestion to re-dissolve fluoride complexes at 190°C for 2 hours.
• Developed an off-line procedure for straightforward isobaric interference correction using constant interference ratios.
• Implemented an off-line Excel VBA procedure for mass-time-intensity drift correction using quality-control solutions without internal standards.

Main Results:

• Achieved data agreement with international rock reference standards (<8% relative error, <5% precision).
• Demonstrated effective re-dissolution of fluoride complexes from refractory phases.
• Established a robust method for isobaric interference and instrumental drift correction.

Conclusions:

• The developed methods offer a significant improvement for trace element analysis in geological samples.
• These techniques are simple, cost-effective, and widely applicable, reducing analysis time by over 60%.