Sample Preparation by Fusion

This section will deal with fusions for trace analysis using inorganic fluxes. These techniques are required for sample types that are inorganic in nature and unreactive toward acid decomposition.

Useful Fusions for Trace Analysts

Fusions are considered to be more of a 'last resort' by trace analysts because:

• They are expensive and often not available (high purity fluxes).
• They yield high solids solutions that can salt out in the nebulizer.
• Large dilutions of the sample are a necessity.
• They often require expensive equipment.
• Spectral interferences from the flux and/or crucible construction material must be considered.
• Contamination of the sample with the crucible construction element and impurities must be considered.
• They are labor intensive.

However I have found it necessary and even advantageous at times to perform a wide variety of fusions. Table 13.1 provides a summary of those that I have found to be most useful:

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