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When is molten salt fusion used instead of acid dissolution?
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Molten salt fusion is employed as an alternative to acid dissolution in analytical chemistry when specific challenges render standard acid-based methods ineffective or impractical. This technique is typically used in the following scenarios:
- Acid Resistance: The sample material is too resistant to be dissolved by acids, even when using high-pressure acid bombs or sealed-vessel microwave digestion techniques.1
- Efficiency: The time required for acid dissolution is considered excessive.1
- Analytical Interference: The only feasible acid-based approach would introduce chemical interferences or result in the loss of the target analyte.1
In this process, a finely ground sample is mixed with a powdered flux in a crucible and heated until it reaches a molten state. Once cooled, the resulting melt is dissolved in water or an aqueous acidic solution for further analysis.1